Annual report pursuant to Section 13 and 15(d)

Other Expenses, Net Other Expenses, Net (Details)

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Other Expenses, Net Other Expenses, Net (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Income and Expenses [Abstract]      
Unrealized (gain) loss on interest rate swaps $ (1,418)us-gaap_GainLossOnDerivativeInstrumentsNetPretax $ (1,459)us-gaap_GainLossOnDerivativeInstrumentsNetPretax $ 98us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Interest expense, net of interest income 5,898us-gaap_InterestIncomeExpenseNonoperatingNet 4,600us-gaap_InterestIncomeExpenseNonoperatingNet 3,496us-gaap_InterestIncomeExpenseNonoperatingNet
Amortization of deferred financing fees, net 1,248us-gaap_AmortizationOfFinancingCostsAndDiscounts 732us-gaap_AmortizationOfFinancingCostsAndDiscounts 456us-gaap_AmortizationOfFinancingCostsAndDiscounts
Foreign currency transaction loss 1,131us-gaap_ForeignCurrencyTransactionLossBeforeTax 0us-gaap_ForeignCurrencyTransactionLossBeforeTax 0us-gaap_ForeignCurrencyTransactionLossBeforeTax
Other expenses, net $ 6,859us-gaap_NonoperatingIncomeExpense $ 3,873us-gaap_NonoperatingIncomeExpense $ 4,050us-gaap_NonoperatingIncomeExpense