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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]        
Foreign currency translation, Beginning balance $ (69,417) $ (67,895)    
Foreign currency translation, Other comprehensive income (loss) before reclassifications 3,894 3,063    
Foreign currency translation, Net other comprehensive income (loss), net of tax 3,894 3,063    
Foreign currency translation, Ending balance (65,523) (64,832)    
Unrealized gain (loss) on hedging activities, Beginning balance (143) (18)    
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications 915 336    
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss (120) (19)    
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax [1] 795 317    
Unrealized gain (loss) on hedging activities, Ending balance 652 299    
Total, Other comprehensive income (loss) before reclassifications 4,809 3,399    
Total, Amounts reclassified from accumulated other comprehensive loss (120) (19)    
Net other comprehensive income (loss), net of tax 4,689 3,380    
Accumulated other comprehensive income (loss), net of tax, total $ (64,871) $ (64,533) $ (69,560) $ (67,913)
[1] Net of tax expense of $212 and $170 for the three months ended March 31, 2018 and 2017, respectively.