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Income Taxes (Net Deferred Income Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Taxes [Abstract] |  |
Foreign tax credits | $ 186,706 | $ 167,685
Unearned premium reserve | 75,130 | 63,309
Loss reserve | 66,025 | 64,135
Net operating loss carryforward | 31,698 | 106,543
Net unrealized losses on benefit plans | 19,818 | 17,921
Unrealized foreign currency losses | 7,964 | 12,596
Investment impairments | 3,961 | 1,291
Uncollectible reinsurance reserve | 3,142 | 3,142
Other tax credits | 2,294 |
Net unrealized investment losses |  | 10,815
Net fair value losses |  | 7,196
Other assets | 13,869 | 11,521
Total deferred tax assets | 410,607 | 466,154
Deferred acquisition costs | 81,931 | 74,736
Net unrealized investment gains | 39,413 |
Net fair value income | 25,936 |
Partnership investments | 15,039 | 14,936
Benefit plan asset | 2,333 | 3,600
Other liabilities | 4,937 | 3,868
Total deferred tax liabilities | 169,589 | 97,140
Net deferred tax assets | 241,018 | 369,014
Less: Valuation allowance | (12,997) | (9,309)
Total net deferred tax assets | $ 228,021 | $ 359,705

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