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Long-Term Debt - Amended and Restated Credit Agreement (Details) (USD $)
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1 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||
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May 31, 2008
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Dec. 31, 2013
Term Loan [Member]
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Dec. 14, 2012
Term Loan [Member]
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Apr. 30, 2011
Secured Debt [Member]
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Dec. 14, 2012
Secured Debt [Member]
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May 15, 2008
Secured Debt [Member]
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May 31, 2008
Secured Debt [Member]
Term Loan [Member]
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Dec. 31, 2013
Revolving Credit Facility [Member]
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Dec. 31, 2013
Revolving Credit Facility [Member]
Minimum [Member]
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Jul. 30, 2013
Unsecured Debt [Member]
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Jul. 19, 2013
Unsecured Debt [Member]
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| Debt Instrument [Line Items] | |||||||||||
| Senior secured credit facility | $ 80,000,000.0 | $ 80,000,000 | $ 50,000,000 | ||||||||
| Term loan | 50,000,000 | 50,000,000 | |||||||||
| Maturity of credit facility | Dec. 14, 2017 | May 14, 2013 | |||||||||
| Increase in the amount of term loan or revolving credit facility | 50,000,000 | 45,000,000 | |||||||||
| Aggregate commitment amount | 180,000,000 | 250,000,000.0 | |||||||||
| Quarterly decrease in borrowing capacity | 2,500,000.0 | ||||||||||
| Maximum borrowing capacity in second year | 40,000,000.0 | ||||||||||
| Maximum borrowing capacity in third year | $ 37,500,000.0 | ||||||||||