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Financial Instruments and Fair Values - Gains and (Loss) of Cash Flow Hedges (Details) - Designated as Hedging Instrument - Interest Rate Swap - Cash Flow Hedging - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in other comprehensive income (loss) - effective portion $ 1,394 $ (19,371)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense - effective portion 0 0
Amount of gain (loss) recognized in other expense - ineffective portion $ (247) $ 0