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Schedule II Condensed Financial Information of Registrant - Condensed Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | $ 376,507 | $ 373,630 | $ 361,186
Realized investment gains |  |  |  |  |  |  |  |  |  |  |  |  | (12,543) | (3,406) | 4,123
Total revenues | $ 278,535 | $ 311,318 | $ 306,257 | $ 295,489 | $ 302,993 | $ 289,817 | $ 291,436 | $ 287,304 | $ 282,873 | $ 291,176 | $ 283,558 | $ 271,303 | 1,191,599 | 1,171,550 | 1,128,910
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 13,001 | 11,948 | 11,808
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,172,062 | 1,082,863 | 1,014,678
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | 1,194 | (80,772) | 30,467
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
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 34 | 20
Realized investment gains |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 34 | 20
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 11,892 | 11,835 | 11,808
Other |  |  |  |  |  |  |  |  |  |  |  |  | 10,898 | 5,101 | 5,631
Total expenses |  |  |  |  |  |  |  |  |  |  |  |  | 22,790 | 16,936 | 17,439
Loss before income tax benefit and equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | (22,690) | (16,902) | (17,419)
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | (4,723) | (6,667) | (6,076)
Loss before equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | (17,967) | (10,235) | (11,343)
Equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 36,310 | 179,694 | 95,108
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,343 | $ 169,459 | $ 83,765

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