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Summary of Significant Accounting Policies - Deferred Financing (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in deferred financing costs      
Balance at the beginning of the period $ 2,216us-gaap_DeferredFinanceCostsNoncurrentNet $ 2,794us-gaap_DeferredFinanceCostsNoncurrentNet $ 3,402us-gaap_DeferredFinanceCostsNoncurrentNet
Write-off of unamortized capitalized deferred financing costs (701)us-gaap_WriteOffOfDeferredDebtIssuanceCost    
Deferred financing costs capitalized on new debt 1,549us-gaap_PaymentsOfDebtIssuanceCosts    
Amortization of deferred financing costs (579)us-gaap_AmortizationOfFinancingCosts (578)us-gaap_AmortizationOfFinancingCosts (776)us-gaap_AmortizationOfFinancingCosts
Balance at the end of the period 2,485us-gaap_DeferredFinanceCostsNoncurrentNet 2,216us-gaap_DeferredFinanceCostsNoncurrentNet 2,794us-gaap_DeferredFinanceCostsNoncurrentNet
Revolving credit facility      
Changes in deferred financing costs      
Deferred financing costs capitalized on new debt     $ 168us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember