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Income Taxes (Net Deferred Income Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Taxes [Abstract] |  |
Loss reserve | $ 96,840 | $ 66,025
Unearned premium reserve | 85,028 | 75,130
Foreign tax credits | 46,109 | 186,706
Net operating loss carryforward | 33,504 | 31,698
Lease liability | 31,989 | 33,042
Net unrealized losses on benefit plans | 19,636 | 19,818
Equity compensation | 7,367 | 7,817
Other tax credits | 4,591 | 2,294
Uncollectible reinsurance reserves | 3,142 | 3,142
Investment impairments | 1,121 | 3,961
Unrealized foreign currency losses | 603 | 7,964
Other assets | 7,285 | 4,520
Total deferred tax assets | 337,215 | 442,117
Net unrealized investment gains | 90,268 | 39,413
Deferred acquisition costs | 79,994 | 81,931
Net fair value income | 75,692 | 25,936
Right of use asset | 28,822 | 31,510
Partnership investments | 26,119 | 15,039
Benefit plan asset | 1,765 | 2,333
Other liabilities | 6,710 | 4,937
Total deferred tax liabilities | 309,370 | 201,099
Net deferred tax assets | 27,845 | 241,018
Less: Valuation allowance | (28,805) | (12,997)
Total net deferred tax assets |  | $ 228,021
Total net deferred tax assets | $ (960) |

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