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Debt (Details) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 9 Months Ended | ||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2012
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Sep. 30, 2013
Base Rate [Member]
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Sep. 30, 2013
LIBOR [Member]
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Sep. 30, 2013
Term loan [Member]
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Jul. 31, 2011
Term loan [Member]
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Sep. 30, 2013
Term loan [Member]
July 2012 to June 2014 [Member]
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| Debt Instrument [Line Items] | |||||||||||
| Debt Instrument, Maturity Date | Jun. 30, 2016 | ||||||||||
| Financing costs | $ 1,700,000 | ||||||||||
| Amortization period of debt issuance costs | 5Y | ||||||||||
| Borrowings outstanding | 65,600,000 | 65,600,000 | 92,200,000 | ||||||||
| Term loan payments 2013 | 6,200,000 | 6,200,000 | |||||||||
| Term loan payments 2014 | 25,000,000 | 25,000,000 | |||||||||
| Term loan payments 2015 | 34,400,000 | 34,400,000 | |||||||||
| Revolving loans maximum borrowing capacity | 125,000,000 | 125,000,000 | |||||||||
| Revolving loans potential increment in maximum borrowing capacity | 175,000,000 | ||||||||||
| Revolving loans amount outstanding | 39,300,000 | 39,300,000 | 48,000,000 | ||||||||
| Letters of credit outstanding | 573,000 | 573,000 | 1,300,000 | ||||||||
| Debt outstanding | 104,900,000 | 104,900,000 | 140,200,000 | ||||||||
| Base margin (in hundredths) | 0.25% | 2.00% | |||||||||
| Duration of interest rate cash flow hedge | 3 years | ||||||||||
| Amount of interest rate hedge | 57,200,000 | 101,000,000 | |||||||||
| Effective interest rate on the hedged term debt | 1.615% plus our base margin | ||||||||||
| Interest rate range, minimum (in hundredths) | 2.18% | ||||||||||
| Interest rate range, maximum (in hundredths) | 3.62% | ||||||||||
| Effective interest rate (in hundredths) | 3.08% | 3.08% | |||||||||
| Interest expense, net | $ 877,000 | $ 1,400,000 | $ 2,900,000 | $ 3,900,000 | |||||||