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Statutory Information and Restrictions - Reconciliations of Statutory Capital, Surplus and Net Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Insurance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory capital and surplus of insurance subsidiaries | $ 868,839 |  |  |  | $ 903,564 |  |  |  |  |  |  |  | $ 868,839 | $ 903,564 |
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 276,668 |  |  |  | 298,742 |  |  |  |  |  |  |  | 276,668 | 298,742 |
Deposit asset on reinsurance | 2,346,166 |  |  |  | 0 |  |  |  |  |  |  |  | 2,346,166 | 0 |
Annuity reserves ceded | (2,239,717) |  |  |  | 0 |  |  |  |  |  |  |  | (2,239,717) | 0 |
Difference in policyholder reserves | 209,127 |  |  |  | 142,601 |  |  |  |  |  |  |  | 209,127 | 142,601 |
Goodwill | 49,079 |  |  |  | 47,396 |  |  |  |  |  |  |  | 49,079 | 47,396 |
Intangible assets, net | 177,217 |  |  |  | 0 |  |  |  |  |  |  |  | 177,217 | 0 |
Investment fair value adjustments on fixed maturity securities | 397,762 |  |  |  | 142,512 |  |  |  |  |  |  |  | 397,762 | 142,512 |
Difference in investment reserves | 102,380 |  |  |  | 105,430 |  |  |  |  |  |  |  | 102,380 | 105,430 |
Federal income tax liability | (178,026) |  |  |  | (115,667) |  |  |  |  |  |  |  | (178,026) | (115,667) |
Net funded status of benefit plans | (13,690) |  |  |  | (15,495) |  |  |  |  |  |  |  | (13,690) | (15,495) |
Non-admitted assets and other, net | (53,801) |  |  |  | 20,412 |  |  |  |  |  |  |  | (53,801) | 20,412 |
Shareholders' equity of parent company and non-insurance subsidiaries | 8,306 |  |  |  | 8,795 |  |  |  |  |  |  |  | 8,306 | 8,795 |
Parent company short-term and long-term debt | (383,025) |  |  |  | (247,740) |  |  |  |  |  |  |  | (383,025) | (247,740) |
Total shareholders' equity | 1,567,285 |  |  |  | 1,290,550 |  |  |  | $ 1,501,573 |  |  |  | 1,567,285 | 1,290,550 | $ 1,501,573
Statutory net income of insurance subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 62,316 | 45,977 | 82,587
Net loss of non-insurance companies |  |  |  |  |  |  |  |  |  |  |  |  | (9,537) | (9,755) | (4,496)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (14,272) | (11,892) | (11,836)
Tax benefit of interest expense and other parent company current tax adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 8,993 | 121 | 5,654
Combined net income |  |  |  |  |  |  |  |  |  |  |  |  | 47,500 | 24,451 | 71,909
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  | 2,101 | 1,015 | 9,385
Intangible asset amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | (8,790) | 0 | 0
Policyholder benefits |  |  |  |  |  |  |  |  |  |  |  |  | 117,369 | 26,318 | 30,609
Federal income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  |  |  | (23,492) | 3,020 | 84,198
Investment reserves |  |  |  |  |  |  |  |  |  |  |  |  | 88,627 | (31,529) | (20,966)
Other adjustments, net |  |  |  |  |  |  |  |  |  |  |  |  | (38,872) | (4,932) | (5,676)
Net income | $ 33,001 | $ 25,454 | $ 93,822 | $ 32,166 | $ (20,257) | $ 12,528 | $ 5,917 | $ 20,155 | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 184,443 | $ 18,343 | $ 169,459

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