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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                
Foreign currency translation, Beginning balance $ (82,944) $ (75,551) $ (69,417) $ (67,895)        
Foreign currency translation, Other comprehensive income (loss) before reclassifications (3,339) 6,483 (16,866) 15,822        
Foreign currency translation, Net other comprehensive income (loss), net of tax (3,339) 6,483 (16,866) 15,822        
Foreign currency translation, Reclassification of foreign currency translation associated with noncontrolling interest acquired       (16,995)        
Foreign currency translation, Ending balance (86,283) (69,068) (86,283) (69,068)        
Unrealized gain (loss) on hedging activities, Beginning balance 493 292 (143) (18)        
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications 258 36 1,372 466        
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss (226) (174) (704) (294)        
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax [1] 32 (138) 668 172        
Unrealized gain (loss) on hedging activities, Ending balance 525 154 525 154        
Total, Other comprehensive income (loss) before reclassifications (3,081) 6,519 (15,494) 16,288        
Total, Amounts reclassified from accumulated other comprehensive loss (226) (174) (704) (294)        
Net other comprehensive income (loss), net of tax (3,307) 6,345 (16,198) 15,994        
Accumulated other comprehensive income (loss), net of tax, total $ (85,758) $ (68,914) $ (85,758) $ (68,914) $ (82,451) $ (69,560) $ (75,259) $ (67,913)
[1] Net of tax expense (benefit) of $47 and $(74) for the three months ended September 30, 2018 and 2017, respectively. Net of tax expense of $218 and $93 for the nine months ended September 30, 2018 and 2017, respectively.