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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax asset: |  |
Loss reserve discounting | $ 192,181 | $ 162,636
Unearned premiums | 180,326 | 163,143
Unrealized investment losses | 228,456 | 0
Net operating losses & foreign tax credits | 58,182 | 88,502
Other-than-temporary impairments | 5,935 | 5,176
Employee compensation plans | 63,313 | 61,301
Other | 72,536 | 54,269
Gross deferred tax asset | 800,929 | 535,027
Less valuation allowance | (47,166) | (75,230)
Deferred tax asset | 753,763 | 459,797
Deferred tax liability: |  |
Amortization of intangibles | 13,973 | 12,787
Loss reserve discounting - transition rule | 14,843 | 19,796
Deferred policy acquisition costs | 157,055 | 137,893
Unrealized investment gains | 0 | 36,850
Property, furniture and equipment | 45,887 | 43,186
Investment funds | 125,525 | 101,999
Other | 67,479 | 67,331
Deferred tax liability | 424,762 | 419,842
Net deferred tax asset | 329,001 | 39,955
Operating Loss Carryforwards [Line Items] |  |
Income taxes receivable | 5,000 |
Current federal income taxes |  | 3,000
Valuation allowance | 47,000 | $ 75,000
Foreign Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards, subject to expire | 4,000 |
Operating loss carryforwards, not subject to expire | $ 225,000 |

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