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 7)

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Forward Contracts Designated as Cash Flow Hedges (Details 7) - Cash Flow Hedging - Designated as Hedging Instrument - Foreign Currency Forward Contracts - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in other comprehensive income (loss) - effective portion $ 36,928 $ 88 $ (60,447) $ (988)
Gain (loss) recognized in other income (expense) - ineffective portion 8   (7) (1)
Amount reclassified from accumulated other comprehensive income (loss) into depreciation and amortization expense $ (63) $ (64) $ (127) $ (117)