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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

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