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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                    
Foreign currency translation, Beginning balance $ (87,537)   $ (86,044) $ (82,944)   $ (69,417) $ (86,044) $ (69,417)    
Foreign currency translation, Other comprehensive income (loss) before reclassifications (11,727)     (3,339)     (13,220) (16,866)    
Foreign currency translation, Net other comprehensive income (loss), net of tax (11,727)     (3,339)     (13,220) (16,866)    
Foreign currency translation, Ending balance (99,264) $ (87,537)   (86,283) $ (82,944)   (99,264) (86,283)    
Unrealized gain (loss) on on derivatives, Beginning balance 222   292 493   (143) 292 (143)    
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications (23)     258     313 1,372    
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss (103)     (226)     (509) (704)    
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax (126) [1] (112) $ 42 32 [1] (159) $ 795 (196) [1] 668 [1]    
Unrealized gain (loss) on on derivatives, Ending balance 96 222   525 493   96 525    
Total, Other comprehensive income (loss) before reclassifications (11,750)     (3,081)     (12,907) (15,494)    
Total, Amounts reclassified from accumulated other comprehensive loss (103)     (226)     (509) (704)    
Total, Net other comprehensive income (loss), net of tax (11,853)     (3,307)     (13,416) (16,198)    
Accumulated other comprehensive income (loss), net of tax, total $ (99,168) $ (87,315)   $ (85,758) $ (82,451)   $ (99,168) $ (85,758) $ (85,752) $ (69,560)
[1] Net of tax expense (benefit) of $(34) and $47 for the three months ended September 30, 2019 and 2018, respectively. Net of tax expense (benefit) of $(53) and $218 for the nine months ended September 30, 2019 and 2018, respectively.