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Summary of Significant Accounting Policies (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies      
Foreign currency translation, Beginning balance $ (91,472) $ (86,044)  
Foreign currency translation, Other comprehensive income (loss) before reclassifications 2,677 (5,428)  
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax 2,677 (5,428)  
Foreign currency translation, Ending balance (88,795) (91,472) $ (86,044)
Unrealized gain (loss) on on derivatives, Beginning balance   292  
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications (2,366) 355  
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss 1,526 (647)  
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax (840) (292) 435
Unrealized gain (loss) on on derivatives, Ending balance (840)   292
Accumulated other comprehensive income (loss), Beginning balance (91,472) (85,752)  
Total, Other comprehensive loss before reclassifications 311 (5,073)  
Total, Amounts reclassified from accumulated other comprehensive loss 1,526 (647)  
Total, Net other comprehensive loss, net of tax 1,837 (5,720)  
Accumulated other comprehensive income (loss), Ending balance $ (89,635) $ (91,472) $ (85,752)