Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of foreign currency forward contracts designated as cash flow hedges (Details 5)

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Fair Value Measurements and Derivatives - Effects of foreign currency forward contracts designated as cash flow hedges (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in other income (expense), net - ineffective portion     $ (30,700)
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency forward contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ 254,070 $ (124,058) (84,187)
Loss recognized in other income (expense), net - ineffective portion (73) (270) (343)
Amount reclassified from accumulated comprehensive income (loss) into depreciation and amortization expense $ 3,121 $ 2,625 $ 116