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 5)

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Options Designated as Cash Flow Hedges (Details 5) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Currency Options        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount reclassified from accumulated other comprehensive income (loss) into depreciation and amortization expense $ 330 $ 330 $ 660 $ 660