Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Options Designated as Cash Flow Hedges (Details 6) - Cash Flow Hedging - Designated as Hedging Instrument - Foreign Currency Options - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Loss recognized in other comprehensive income (loss) - effective portion $ (1,157)
Loss recognized in other income (expense) - ineffective portion (241)
Amount reclassified from accumulated other comprehensive income (loss) into depreciation and amortization expense $ 330 $ 330 $ 990 $ 938