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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]        
Foreign currency translation, Beginning balance $ (67,895) $ (70,296)    
Foreign currency translation, Other comprehensive income (loss) before reclassifications 3,063 4,728    
Foreign currency translation, Amounts reclassified from accumulated other comprehensive loss    
Foreign currency translation, Net other comprehensive income (loss), net of tax 3,063 4,728    
Foreign currency translation, Ending balance (64,832) (65,568)    
Unrealized gain (loss) on hedging activities, Beginning balance (18) 390    
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications 336 (494)    
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss (19) 44    
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax 317 (450)    
Unrealized gain (loss) on hedging activities, Ending balance 299 (60)    
Benefit plan liability, Beginning balance 84    
Benefit plan liability, Other comprehensive loss before reclassifications    
Benefit plan liability, Amounts reclassified from accumulated other comprehensive loss    
Benefit plan liability, Net other comprehensive income (loss), net of tax    
Benefit plan liability, Ending balance 84    
Total, Other comprehensive income (loss) before reclassifications 3,399 4,234    
Total, Amounts reclassified from accumulated other comprehensive loss (19) 44    
Net other comprehensive income (loss), net of tax 3,380 4,278    
Accumulated other comprehensive income (loss), net of tax, total $ (64,533) $ (65,544) $ (67,913) $ (69,822)