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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                
Foreign currency translation, Beginning balance $ (63,735) $ (57,543) $ (70,296) $ (45,603)        
Foreign currency translation, Other comprehensive income (loss) before reclassifications (638) (12,557) 5,923 (24,497)        
Foreign currency translation, Net other comprehensive income (loss), net of tax (638) (12,557) 5,923 (24,497)        
Foreign currency translation, Ending balance (64,373) (70,100) (64,373) (70,100)        
Unrealized gain (loss) on hedging activities, Beginning balance (19) 208 390 1        
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications (129) (578) (656) (681)        
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss 65 342 183 652        
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax (64) (236) (473) (29)        
Unrealized gain (loss) on hedging activities, Ending balance (83) (28) (83) (28)        
Benefit plan liability, Beginning balance 84 84 84 129        
Benefit plan liability, Other comprehensive loss before reclassifications       (45)        
Benefit plan liability, Amounts reclassified from accumulated other comprehensive loss (84)   (84)          
Benefit plan liability, Net other comprehensive income (loss), net of tax (84)   (84) (45)        
Benefit plan liability, Ending balance   84   84        
Total, Other comprehensive income (loss) before reclassifications (767) (13,135) 5,267 (25,223)        
Total, Amounts reclassified from accumulated other comprehensive loss (19) 342 99 652        
Net other comprehensive income (loss), net of tax (786) (12,793) 5,366 (24,571)        
Accumulated other comprehensive income (loss), net of tax, total $ (64,456) $ (70,044) $ (64,456) $ (70,044) $ (63,670) $ (69,822) $ (57,251) $ (45,473)