Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Foreign Currency Collar Designated as Cash Flow Hedges (Details 8)

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Collar Designated as Cash Flow Hedges (Details 8) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Currency Collar        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount reclassified from accumulated other comprehensive income (loss) into depreciation and amortization expense $ (91) $ (91) $ (273) $ (273)