Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Interest Rates Swaps Designated as Cash Flow Hedges (Details 9)

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Fair Value Measurements and Derivatives - Effects of Interest Rates Swaps Designated as Cash Flow Hedges (Details 9) - Cash Flow Hedging - Designated as Hedging Instrument - Interest Rate Swap - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income - effective portion $ (25) $ 818 $ 234 $ (2,638)
Gain recognized in other income (expense), net - ineffective portion 0 0 0 3
Amount reclassified from accumulated other comprehensive income (loss) into interest expense, net $ 691 $ 996 $ 2,301 $ 2,977