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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                
Foreign currency translation, Beginning balance $ (89,848) $ (86,044) $ (65,523) $ (69,417) $ (86,044) $ (69,417)    
Foreign currency translation, Other comprehensive income (loss) before reclassifications 2,311   (17,421)   (1,493) (13,527)    
Foreign currency translation, Net other comprehensive income (loss), net of tax 2,311   (17,421)   (1,493) (13,527)    
Foreign currency translation, Ending balance (87,537) (89,848) (82,944) (65,523) (87,537) (82,944)    
Unrealized gain (loss) on on derivatives, Beginning balance 334 292 652 (143) 292 (143)    
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications 123   19   336 933    
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss (235)   (178)   (406) (297)    
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax (112) [1] 42 (159) [1] 795 (70) [1] 636 [1]    
Unrealized gain (loss) on on derivatives, Ending balance 222 334 493 652 222 493    
Total, Other comprehensive income (loss) before reclassifications 2,434   (17,402)   (1,157) (12,594)    
Total, Amounts reclassified from accumulated other comprehensive loss (235)   (178)   (406) (297)    
Total, Net other comprehensive income (loss), net of tax 2,199   (17,580)   (1,563) (12,891)    
Accumulated other comprehensive income (loss), net of tax, total $ (87,315) $ (89,514) $ (82,451) $ (64,871) $ (87,315) $ (82,451) $ (85,752) $ (69,560)
[1] Net of tax benefit of $(30) and $(41) for the three months ended June 30, 2019 and 2018, respectively. Net of tax expense (benefit) of $(19) and $171 for the six months ended June 30, 2019 and 2018, respectively.