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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]        
Foreign currency translation, Beginning balance $ (70,296) $ (45,603)    
Foreign currency translation, Other comprehensive income (loss) before reclassifications 4,728 (14,962)    
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax 4,728 (14,962)    
Foreign currency translation, Ending balance (65,568) (60,565)    
Unrealized gain (loss) on hedging activities, Beginning balance 390 1    
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications (494) 797    
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss 44 138    
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax (450) 935    
Unrealized gain (loss) on hedging activities, Ending balance (60) 936    
Benefit plan liability, Beginning balance 84 129    
Benefit plan liability, Other comprehensive loss before reclassifications   (45)    
Benefit plan liability, Other comprehensive income (loss)   (45)    
Benefit plan liability, Ending balance 84 84    
Total, Other comprehensive income (loss) before reclassifications 4,234 (14,210)    
Total, Amounts reclassified from accumulated other comprehensive loss 44 138    
Other comprehensive income (loss), net of tax 4,278 (14,072)    
Accumulated other comprehensive income (loss), net of tax, total $ (65,544) $ (59,545) $ (69,822) $ (45,473)