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Equity and Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Equity and Accumulated Other Comprehensive Loss [Abstract]                    
Foreign currency translation, Beginning balance $ (92,401)   $ (88,795) $ (106,770)   $ (91,472) $ (88,795) $ (91,472)    
Foreign currency translation, Other comprehensive income (loss) before reclassifications (7,100)     5,975     (10,706) (9,323)    
Foreign currency translation, Net other comprehensive income (loss), net of tax (7,100)     5,975     (10,706) (9,323)    
Foreign currency translation, Ending balance (99,501) $ (92,401)   (100,795) $ (106,770)   (99,501) (100,795)    
Unrealized gain (loss) on on derivatives, Beginning balance (583)   (840) (2,445)   0 (840) 0    
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications (141)     505     100 (2,905)    
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss 8     517     24 1,482    
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax (133) [1] 386 $ (129) 1,022 [1] 1,210 $ (3,655) 124 [1] (1,423) [1]    
Unrealized gain (loss) on on derivatives, Ending balance (716) (583)   (1,423) (2,445)   (716) (1,423)    
Total, Other comprehensive income (loss) before reclassifications (7,241)     6,480     (10,606) (12,228)    
Total, Amounts reclassified from accumulated other comprehensive loss 8     517     24 1,482    
Total, Net other comprehensive income (loss), net of tax (7,233)     6,997     (10,582) (10,746)    
Accumulated other comprehensive income (loss), net of tax, total $ (100,217) $ (92,984)   $ (102,218) $ (109,215)   $ (100,217) $ (102,218) $ (89,635) $ (91,472)
[1] Net of tax expense of $120 for the three and nine months ended September 30, 2021.