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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Valuation Allowance [Line Items] |  |
Deferred tax assets, valuation allowance | $ 0 | $ 0
Net operating loss carryforwards | 178,600 |
Deferred income tax assets: |  |
Policy benefit reserves | 1,733,672 | 1,538,371
Other than temporary impairments | 15,166 | 9,804
Net unrealized losses on available for sale fixed maturity securities | 0 | 19,928
Derivative instruments | 0 | 141,075
Amounts due reinsurer | 8,784 | 0
Other policyholder funds | 4,359 | 3,368
Deferred compensation | 3,705 | 3,334
Share-based compensation | 2,775 | 3,169
Net operating loss carryforwards | 37,509 | 2,286
Other | 14,677 | 9,439
Gross deferred tax assets | 1,820,647 | 1,730,774
Deferred income tax liabilities: |  |
Deferred policy acquisition costs and deferred sales inducements | (1,303,385) | (1,214,998)
Net unrealized gains on available for sale fixed maturity securities | (392,189) | 0
Derivative instruments | (109,287) | 0
Policy benefit reserves | (147,924) | (172,578)
Investment income items | (42,105) | (37,795)
Amounts due reinsurer | 0 | (12,620)
Other | (3,654) | (1,614)
Gross deferred tax liabilities | (1,998,544) | (1,439,605)
Net deferred income tax asset (liability) | (177,897) |
Net deferred income tax asset (liability) |  | $ 291,169
Deferred Tax Asset, Valuation Allowance, Unrealized Losses on Available For Sale Fixed Maturity Securities |  |
Valuation Allowance [Line Items] |  |
Deferred tax assets, valuation allowance | $ 0 |

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