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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Income before income taxes |  |  | $ 565,742 | $ 316,271 | $ 130,247
Income tax expense on income before income taxes |  |  | 118,806 | 110,695 | 45,586
Tax effect of: State income taxes |  |  | 5,777 | 1,961 | 2,559
Tax effect of: Tax exempt net investment income |  |  | (4,223) | (4,288) | (2,167)
Tax effect of: Impact of Tax Reform |  |  | 0 | 35,932 | 0
Tax effect of: Worthless stock deduction |  |  | (7,448) | 0 | 0
Tax effect of: Other |  |  | (5,186) | (2,674) | 1,026
Total income tax expense included in consolidated statements of operations |  |  | $ 107,726 | $ 141,626 | $ 47,004
Effective tax rate |  |  | 19.00% | 44.80% | 36.10%
Statutory federal income tax rate | 21.00% |  | 21.00% | 35.00% | 35.00%
Enacted tax rate applied to deferred tax balances, percent |  | 21.00% |  |  |

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