Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Foreign Currency Forward Contracts Designated as Cash Flow Hedges (Details 6)

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Forward Contracts Designated as Cash Flow Hedges (Details 6) - Cash Flow Hedging - Designated as Hedging Instrument - Foreign Currency Forward Contracts - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ 36,390 $ (1,519) $ 39,001 $ (61,966)
Loss recognized in other expense - ineffective portion (190) (3) (181) (10)
Amount reclassified from accumulated other comprehensive income (loss) into depreciation and amortization expense $ 665 $ (64) $ 1,966 $ (191)