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Derivative Instruments Derivative Instruments - Assets and liabilities presented on a net basis due to the right of offset (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative Asset, Fair Value, Gross Asset $ 16 $ 117
Derivative Asset gross amount offset 0 (73)
Net amount of assets presented 16 44
Derivative Liability, Fair Value, Gross Liability 13 11
Derivative liability gross amount offset 0 0
Net amount of liabilities presented $ 13 $ 11