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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income before income taxes | $ 815,961 | $ 315,565 | $ 565,742
Income tax expense on income before income taxes | 171,352 | 66,269 | 118,806
Tax effect of: State income taxes | 5,749 | 5,111 | 5,777
Tax effect of: Tax exempt net investment income | (4,602) | (4,385) | (4,223)
Tax effect of: Tax rate differential on net operating loss carryback | (30,041) | 0 | 0
Tax effect of: Worthless stock deduction | 0 | 0 | (7,448)
Tax effect of: Other | 2,043 | 2,480 | (5,186)
Total income tax expense included in consolidated statements of operations | $ 144,501 | $ 69,475 | $ 107,726
Effective tax rate | 17.70% | 22.00% | 19.00%
Statutory federal income tax rate | 21.00% | 21.00% | 21.00%
Effective statutory tax rate used for net operating loss carryback | 35.00% |  |

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