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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]        
Foreign currency translation, Beginning balance $ (86,044) $ (69,417)    
Foreign currency translation, Other comprehensive income (loss) before reclassifications (3,804) 3,894    
Foreign currency translation, Net other comprehensive income (loss), net of tax (3,804) 3,894    
Foreign currency translation, Ending balance (89,848) (65,523)    
Unrealized gain (loss) on on derivatives, Beginning balance 292 (143)    
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications 213 915    
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss (171) (120)    
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax [1] 42 795    
Unrealized gain (loss) on on derivatives, Ending balance 334 652    
Total, Other comprehensive income (loss) before reclassifications (3,591) 4,809    
Total, Amounts reclassified from accumulated other comprehensive loss (171) (120)    
Total, Net other comprehensive income (loss), net of tax (3,762) 4,689    
Accumulated other comprehensive income (loss), net of tax, total $ (89,514) $ (64,871) $ (85,752) $ (69,560)
[1] Net of tax expense of $11 and $212 for the three months ended March 31, 2019 and 2018, respectively.