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Schedule II Financial Information of Registrant Parent Company Statement of Operations (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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income (Note 6) | $ 41,432 | $ 42,756 | $ 43,761 | $ 43,847 | $ 42,051 | $ 38,995 | $ 37,473 | $ 33,956 | $ 171,796 | $ 152,475 | $ 127,248
Net gains (losses) on investments and other financial instruments | 4,257 | 13,009 | 12,540 | 21,913 | (11,705) | (4,480) | (7,404) | (18,887) | 51,719 | (42,476) | 3,621
Other income |  |  |  |  |  |  |  |  | 3,495 | 4,028 | 2,886
Total revenues |  |  |  |  |  |  |  |  | 1,526,955 | 1,273,006 | 1,221,631
Expenses: |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (22,738) | 0 | (51,469)
Interest expense |  |  |  |  |  |  |  |  | 56,310 | 61,490 | 62,761
Total expenses (Note B) |  |  |  |  |  |  |  |  | 677,962 | 588,820 | 874,894
Pretax income (loss) |  |  |  |  |  |  |  |  | 848,993 | 684,186 | 346,737
Income tax benefit |  |  |  |  |  |  |  |  | 176,684 | 78,175 | 225,649
Net income | $ 161,184 | $ 173,438 | $ 166,730 | $ 170,957 | $ 139,779 | $ 142,797 | $ 208,949 | $ 114,486 | 672,309 | 606,011 | 121,088
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 171,408 | (86,953) | 35,480
Comprehensive income |  |  |  |  |  |  |  |  | 843,717 | 519,058 | 156,568
Parent Company |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Net investment income (Note 6) |  |  |  |  |  |  |  |  | 19,751 | 21,294 | 22,528
Net gains (losses) on investments and other financial instruments |  |  |  |  |  |  |  |  | 12,863 | (470) | (328)
Other income |  |  |  |  |  |  |  |  | 218 | 0 | 80
Total revenues |  |  |  |  |  |  |  |  | 32,832 | 20,824 | 22,280
Expenses: |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 22,738 | 0 | 51,469
Interest expense |  |  |  |  |  |  |  |  | 0 | 17,805 | 18,033
Total expenses (Note B) |  |  |  |  |  |  |  |  | 22,738 | 17,805 | 69,502
Pretax income (loss) |  |  |  |  |  |  |  |  | 10,094 | 3,019 | (47,222)
Income tax benefit |  |  |  |  |  |  |  |  | (19,997) | (3,319) | (141,437)
Equity in net income of affiliates |  |  |  |  |  |  |  |  | 642,218 | 599,673 | 26,873
Net income |  |  |  |  |  |  |  |  | 672,309 | 606,011 | 121,088
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 171,408 | (86,953) | 35,480
Comprehensive income |  |  |  |  |  |  |  |  | $ 843,717 | $ 519,058 | $ 156,568

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