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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial Instruments [Abstract]    
Debt, Fair Value $ 446,139us-gaap_LongTermDebtFairValue $ 868,406us-gaap_LongTermDebtFairValue
Debt, Carrying Value 432,181us-gaap_LongTermDebt 870,878us-gaap_LongTermDebt
Derivative instruments, Fair Value   9,245us-gaap_DerivativeLiabilities
Derivative instruments, Carrying Value   $ 9,245us-gaap_DerivativeLiabilityNotionalAmount