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Selected Quarterly Data (Unaudited) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Segment Reporting Information [Line Items] | |||||||||||
| Revenues | $ 136,860,000 | $ 134,237,000 | $ 135,671,000 | $ 139,987,000 | $ 139,525,000 | $ 150,108,000 | $ 145,708,000 | $ 145,421,000 | $ 546,755,000 | $ 580,762,000 | $ 810,955,000 |
| Operating income | 11,764,000 | 14,267,000 | 12,552,000 | 12,493,000 | 11,113,000 | 11,228,000 | 7,059,000 | 6,677,000 | 51,076,000 | 36,077,000 | 37,940,000 |
| Income from continuing operations | 6,478,000 | 7,486,000 | 6,631,000 | 6,769,000 | 6,048,000 | 6,021,000 | 4,082,000 | 4,039,000 | 27,364,000 | 20,190,000 | 23,505,000 |
| Loss from discontinued operations | (4,111,000) | (1,522,000) | (336,000) | (101,000) | 1,000 | 99,000 | 129,000 | 133,000 | (6,070,000) | 362,000 | 182,000 |
| Net income | 2,367,000 | 5,964,000 | 6,295,000 | 6,668,000 | 6,049,000 | 6,120,000 | 4,211,000 | 4,172,000 | 21,294,000 | 20,552,000 | 23,687,000 |
| Basic earnings per share: | |||||||||||
| Income from continuing operations (in dollars per share) | $ 1.23 | $ 1.42 | $ 1.25 | $ 1.29 | $ 1.15 | $ 1.15 | $ 0.78 | $ 0.77 | $ 5.18 | $ 3.86 | $ 4.53 |
| (Loss) income from discontinued operations (in dollars per share) | $ (0.78) | $ (0.29) | $ (0.06) | $ (0.02) | $ 0 | $ 0.02 | $ 0.02 | $ 0.03 | $ (1.15) | $ 0.07 | $ 0.03 |
| Net income (in dollars per share) | $ 0.45 | $ 1.13 | $ 1.19 | $ 1.27 | $ 1.15 | $ 1.17 | $ 0.80 | $ 0.80 | $ 4.03 | $ 3.93 | $ 4.56 |
| Basic weighted average shares outstanding | 5,238,000 | 5,287,000 | 5,287,000 | 5,267,000 | 5,238,000 | 5,238,000 | 5,237,000 | 5,214,000 | 5,282,047 | 5,232,055 | 5,189,263 |
| Diluted earnings per share: | |||||||||||
| Income from continuing operations (in dollars per share) | $ 1.22 | $ 1.41 | $ 1.24 | $ 1.28 | $ 1.14 | $ 1.14 | $ 0.78 | $ 0.77 | $ 5.15 | $ 3.83 | $ 4.50 |
| (Loss) income from discontinued operations (in dollars per share) | $ (0.77) | $ (0.29) | $ (0.06) | $ (0.02) | $ 0 | $ 0.02 | $ 0.02 | $ 0.03 | $ (1.14) | $ 0.07 | $ 0.03 |
| Net income (in dollars per share) | $ 0.45 | $ 1.12 | $ 1.18 | $ 1.26 | $ 1.14 | $ 1.16 | $ 0.80 | $ 0.80 | $ 4.01 | $ 3.90 | $ 4.53 |
| Diluted weighted average shares outstanding | 5,323,000 | 5,311,000 | 5,312,000 | 5,293,000 | 5,293,000 | 5,268,000 | 5,268,000 | 5,242,000 | 5,309,862 | 5,267,857 | 5,219,234 |
| Understated assets and liabilities due to capital lease obligations | $ 6,600,000 | $ 6,600,000 | |||||||||
| X | ||||||||||
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- Definition
Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income or loss derived from discontinued operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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