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Debt (Details) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2012
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Jun. 30, 2013
Base Rate [Member]
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Jun. 30, 2013
LIBOR [Member]
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Jun. 30, 2013
Term loan [Member]
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Jul. 31, 2011
Term loan [Member]
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Jun. 30, 2013
Term loan [Member]
July 2011 to June 2012 [Member]
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Jun. 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 | 71,900,000 | 71,900,000 | 92,200,000 | |||||||||
| Term loan payments 2013 | 12,500,000 | 12,500,000 | ||||||||||
| 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 | 46,900,000 | 46,900,000 | 48,000,000 | |||||||||
| Letters of credit outstanding | 573,000 | 573,000 | 1,300,000 | |||||||||
| Debt outstanding | 118,800,000 | 118,800,000 | 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 | 63,400,000 | 101,000,000 | ||||||||||
| Effective interest rate on the hedged term debt | 0.56% plus our base margin | 1.615% plus our base margin | ||||||||||
| Interest rate range, minimum (in hundredths) | 2.19% | |||||||||||
| Interest rate range, maximum (in hundredths) | 3.62% | |||||||||||
| Effective interest rate (in hundredths) | 3.03% | 3.03% | ||||||||||
| Interest expense, net | $ 987,000 | $ 1,200,000 | $ 2,000,000 | $ 2,500,000 | ||||||||