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Derivatives (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Foreign currency option contracts | Derivatives not designated as hedging instruments              
Derivative Instruments, Gain (Loss) [Line Items]              
Net (loss) gain recognized in earnings $ 0 [1] $ 0 [1] $ (1,132) [1] $ 0 [1] $ 0 [2] $ 0 [2] $ 0 [2]
Foreign currency option contracts | Cash Flow Hedging              
Derivative Instruments, Gain (Loss) [Line Items]              
Net (loss) gain recognized in Other Comprehensive Loss, net of tax (40) [3] (20) [3] (177) [3] (250) [3] (259) [4] 31 [4] 0 [4]
Net (loss) gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax [5]         148 0 0
Net (loss) gain recognized in earnings (7) [6] (11) [6] (12) [6] (17) [6] (11) [7] 6 [7] 0 [7]
Foreign currency forward contracts | Derivatives not designated as hedging instruments              
Derivative Instruments, Gain (Loss) [Line Items]              
Net (loss) gain recognized in earnings (2,062) [1] (330) [1] (7,369) [1] (2,392) [1] (890) [2] 4,047 [2] 2,384 [2]
Foreign currency forward contracts | Cash Flow Hedging              
Derivative Instruments, Gain (Loss) [Line Items]              
Net (loss) gain recognized in Other Comprehensive Loss, net of tax (4,492) [3] (9) [3] (14,026) [3] (74) [3] (73) [4] 77 [4] 0 [4]
Net (loss) gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax [5]         (7) 5 0
Net (loss) gain recognized in earnings $ 3 [6] $ 1 [6] $ 8 [6] $ 1 [6] $ 2 [7] $ (2) [7] $ 0 [7]
[1] Classified in Net Foreign Currency Transaction (Losses) Gains.
[2] Classified in Net Foreign Currency Transaction Losses.
[3] Net change in the fair value of the effective portion classified in Other Comprehensive Income
[4] Net change in the fair value of the effective portion classified in Other Comprehensive Loss.
[5] Effective portion classified as Net Sales.
[6] Ineffective portion and amount excluded from effectiveness testing classified in Net Foreign Currency Transaction (Losses) Gains.
[7] Ineffective portion and amount excluded from effectiveness testing classified in Net Foreign Currency Transaction Losses.