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Segment Information - Summarized Financial Information by Segment (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
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | $ 817,333 | $ 794,703 | $ 759,146
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 376,507 | 373,630 | 361,186
Net income (loss) | $ (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
Assets | 11,031,896 |  |  |  | 11,198,340 |  |  |  | 10,576,824 |  |  |  | 11,031,896 | 11,198,340 | 10,576,824
Intersegment eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | (772) | (815) | (855)
Assets | (41,800) |  |  |  | (42,482) |  |  |  | (36,786) |  |  |  | (41,800) | (42,482) | (36,786)
Property and Casualty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (14,243) | 17,790 | 25,644
Property and Casualty | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | 665,734 | 648,263 | 620,514
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 40,104 | 36,178 | 38,998
Assets | 1,236,362 |  |  |  | 1,217,394 |  |  |  | 1,110,958 |  |  |  | 1,236,362 | 1,217,394 | 1,110,958
Retirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 41,736 | 88,473 | 50,674
Retirement | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | 31,269 | 28,003 | 24,937
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 262,634 | 261,994 | 249,410
Assets | 7,866,969 |  |  |  | 8,063,912 |  |  |  | 7,449,777 |  |  |  | 7,866,969 | 8,063,912 | 7,449,777
Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 18,754 | 77,595 | 16,559
Life | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | 120,330 | 118,437 | 113,695
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 74,399 | 76,195 | 73,567
Assets | 1,821,351 |  |  |  | 1,815,732 |  |  |  | 1,912,771 |  |  |  | 1,821,351 | 1,815,732 | 1,912,771
Corporate and Other | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 142 | 78 | 66
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (27,904) | (14,399) | (9,112)
Assets | $ 149,014 |  |  |  | $ 143,784 |  |  |  | $ 140,104 |  |  |  | $ 149,014 | $ 143,784 | $ 140,104

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