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 7)

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Fair Value Measurements and Derivatives - Effects of foreign currency forward contracts designated as cash flow hedges (Details 7) - Designated as Hedging Instrument - Cash Flow Hedging - Foreign currency forward contracts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in other comprehensive income (loss) - effective portion $ (84,187) $ (30,686) $ (2,983)
Gain (loss) recognized in other income (expense) - ineffective portion (343) (7) 67
Amount reclassified from accumulated comprehensive income (loss) into depreciation and amortization expense $ 116 $ (243) $ (84)