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Segment Information - Summarized Financial Information by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | $ 794,703 | $ 759,146 | $ 731,880
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 373,630 | 361,186 | 332,600
Net income (loss) | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 19,823 | $ 26,923 | $ 11,866 | $ 25,153 | $ 21,040 | $ 21,984 | $ 16,183 | $ 34,275 | 169,459 | 83,765 | 93,482
Assets | 11,198,340 |  |  |  | 10,576,824 |  |  |  | 10,056,972 |  |  |  | 11,198,340 | 10,576,824 | 10,056,972
Intersegment eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | (815) | (855) | (891)
Assets | (42,482) |  |  |  | (36,786) |  |  |  | (37,208) |  |  |  | (42,482) | (36,786) | (37,208)
Property and Casualty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 17,790 | 25,644 | 40,043
Property and Casualty | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | 648,263 | 620,514 | 595,958
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 36,178 | 38,998 | 33,461
Assets | 1,217,394 |  |  |  | 1,110,958 |  |  |  | 1,098,415 |  |  |  | 1,217,394 | 1,110,958 | 1,098,415
Retirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 88,473 | 50,674 | 43,384
Retirement | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | 28,003 | 24,937 | 25,378
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 261,994 | 249,410 | 228,378
Assets | 8,063,912 |  |  |  | 7,449,777 |  |  |  | 7,001,411 |  |  |  | 8,063,912 | 7,449,777 | 7,001,411
Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 77,595 | 16,559 | 14,982
Life | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums and contract charges earned |  |  |  |  |  |  |  |  |  |  |  |  | 118,437 | 113,695 | 110,544
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 76,195 | 73,567 | 71,614
Assets | 1,815,732 |  |  |  | 1,912,771 |  |  |  | 1,862,719 |  |  |  | 1,815,732 | 1,912,771 | 1,862,719
Corporate and Other | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized financial information for these segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 78 | 66 | 38
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (14,399) | (9,112) | (4,927)
Assets | $ 143,784 |  |  |  | $ 140,104 |  |  |  | $ 131,635 |  |  |  | $ 143,784 | $ 140,104 | $ 131,635

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