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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                
Foreign currency translation, Beginning balance $ (65,568) $ (60,565) $ (70,296) $ (45,603)        
Foreign currency translation, Other comprehensive income (loss) before reclassifications 1,833 3,022 6,561 (11,940)        
Foreign currency translation, Net other comprehensive income (loss), net of tax 1,833 3,022 6,561 (11,940)        
Foreign currency translation, Ending balance (63,735) (57,543) (63,735) (57,543)        
Unrealized gain (loss) on hedging activities, Beginning balance (60) 936 390 1        
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications (33) (900) (527) (103)        
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss 74 172 118 310        
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax 41 (728) (409) 207        
Unrealized gain (loss) on hedging activities, Ending balance (19) 208 (19) 208        
Benefit plan liability, Beginning balance 84 84 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 84 84        
Total, Other comprehensive income (loss) before reclassifications 1,800 2,122 6,034 (12,088)        
Total, Amounts reclassified from accumulated other comprehensive loss 74 172 118 310        
Other comprehensive income (loss), net of tax 1,874 2,294 6,152 (11,778)        
Accumulated other comprehensive income (loss), net of tax, total $ (63,670) $ (57,251) $ (63,670) $ (57,251) $ (65,544) $ (69,822) $ (59,545) $ (45,473)