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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income before income taxes:                      
Domestic                 $ (25,403) $ 30,464 $ 32,907
Foreign                 14,679 37,929 32,151
(Loss) income before income taxes                 (10,724) 68,393 65,058
Provision for income taxes:                      
Federal                 (3) (4,384) 2,370
State and foreign                 5,182 6,900 6,288
Total current expense (benefit)                 5,179 2,516 8,658
Deferred:                      
Federal                 (8,512) 6,780 3,788
State and foreign                 559 (1,194) (1,236)
Total deferred benefit                 (7,953) 5,586 2,552
(Benefit) provision for income taxes $ 920 $ 1,814 $ (6,721) $ 1,213 $ (4,249) $ 1,450 $ 9,066 $ 1,835 $ (2,774) $ 8,102 $ 11,210