Annual report pursuant to Section 13 and 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) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in other income (expense), net - ineffective portion     $ 30,700
Designated as Hedging Instrument | Cash Flow Hedging | Interest rates swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ 351 $ (1,701) (5,152)
Gain (loss) recognized in other income (expense), net - ineffective portion 0 3 (23)
Amount reclassified from other comprehensive income (loss) into interest expense, net $ 2,997 $ 3,946 $ 4,614