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 9)

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Collar Designated as Cash Flow Hedges (Details 9) - Cash Flow Hedging - Designated as Hedging Instrument - Foreign Currency Collar - 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]        
Loss recognized in other comprehensive income (loss) - effective portion       $ (1,588)
Amount reclassified from accumulated other comprehensive income (loss) into depreciation and amortization expense $ (91) $ (91) $ (182) $ (151)