Annual report pursuant to Section 13 and 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) - Designated as Hedging Instrument - Cash Flow Hedging - Foreign currency collar - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in other comprehensive income (loss) - effective portion $ (1,588)
Amount reclassified from accumulated comprehensive income (loss) $ (364) $ (364) $ (333)