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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
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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Insurance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory capital and surplus of insurance subsidiaries | $ 903,564 |  |  |  | $ 944,139 |  |  |  |  |  |  |  | $ 903,564 | $ 944,139 |
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs | 298,742 |  |  |  | 257,826 |  |  |  |  |  |  |  | 298,742 | 257,826 |
Difference in policyholder reserves | 142,601 |  |  |  | 111,188 |  |  |  |  |  |  |  | 142,601 | 111,188 |
Goodwill | 47,396 |  |  |  | 47,396 |  |  |  |  |  |  |  | 47,396 | 47,396 |
Investment fair value adjustments on fixed maturity securities | 142,512 |  |  |  | 415,775 |  |  |  |  |  |  |  | 142,512 | 415,775 |
Difference in investment reserves | 105,430 |  |  |  | 111,225 |  |  |  |  |  |  |  | 105,430 | 111,225 |
Federal income tax liability | (115,667) |  |  |  | (162,634) |  |  |  |  |  |  |  | (115,667) | (162,634) |
Net funded status of benefit plans | (15,495) |  |  |  | (16,789) |  |  |  |  |  |  |  | (15,495) | (16,789) |
Non-admitted assets and other, net | 20,412 |  |  |  | 28,870 |  |  |  |  |  |  |  | 20,412 | 28,870 |
Shareholders' equity of parent company and non-insurance subsidiaries | 8,795 |  |  |  | 12,046 |  |  |  |  |  |  |  | 8,795 | 12,046 |
Parent company short-term and long-term debt | (247,740) |  |  |  | (247,469) |  |  |  |  |  |  |  | (247,740) | (247,469) |
Total shareholders' equity | 1,290,550 |  |  |  | 1,501,573 |  |  |  | $ 1,293,982 |  |  |  | 1,290,550 | 1,501,573 | $ 1,293,982
Statutory net income of insurance subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 45,977 | 82,587 | 74,574
Net loss of non-insurance companies |  |  |  |  |  |  |  |  |  |  |  |  | (9,755) | (4,496) | (5,135)
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (11,892) | (11,836) | (11,808)
Tax benefit of interest expense and other parent company current tax adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 121 | 5,654 | 5,637
Combined net income |  |  |  |  |  |  |  |  |  |  |  |  | 24,451 | 71,909 | 63,268
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  | 1,015 | 9,385 | 19,442
Policyholder benefits |  |  |  |  |  |  |  |  |  |  |  |  | 26,318 | 30,609 | 14,919
Federal income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  |  |  | 3,020 | 84,198 | (5,312)
Investment reserves |  |  |  |  |  |  |  |  |  |  |  |  | (31,529) | (20,966) | (1,320)
Other adjustments, net |  |  |  |  |  |  |  |  |  |  |  |  | (4,932) | (5,676) | (7,232)
Net income | $ (20,257) | $ 12,528 | $ 5,917 | $ 20,155 | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 19,823 | $ 26,923 | $ 11,866 | $ 25,153 | $ 18,343 | $ 169,459 | $ 83,765

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