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Segment and Geographical Information - Summary of Assets and Profit or Loss 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 487,325 | $ 484,781 | $ 467,815 | $ 459,923 | $ 442,942 | $ 427,300 | $ 413,696 | $ 405,164 | $ 1,899,843 | $ 1,689,102 | $ 1,519,084
Net investment income |  | 21,760 | 20,622 | 20,030 | 19,017 | 19,459 | 19,922 | 19,742 | 19,894 | 81,430 | 79,017 | 79,025
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  |  | 239,730 | 209,399 | 180,582
Share-based compensation |  |  |  |  |  |  |  |  |  | 17,251 | 15,267 | 13,442
Income (loss) before income taxes |  | 107,922 | $ 111,435 | $ 113,765 | $ 82,963 | 108,089 | $ 100,200 | $ 96,389 | $ 74,842 | 416,084 | 379,520 | 337,595
Assets |  | 12,595,048 |  |  |  | 12,460,703 |  |  |  | 12,595,048 | 12,460,703 | 11,438,943
Term Life Insurance Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,123,200 | 992,224 | 866,382
Net investment income |  |  |  |  |  |  |  |  |  | 13,747 | 9,931 | 7,634
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  |  | 228,613 | 201,751 | 172,812
Share-based compensation |  |  |  |  |  |  |  |  |  | 4,135 | 2,662 | 2,652
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 281,904 | 245,657 | 213,361
Assets |  | 6,322,555 |  |  |  | 6,205,837 |  |  |  | 6,322,555 | 6,205,837 | 5,945,502
Investment and Savings Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 655,076 | 572,747 | 524,621
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  |  | 9,766 | 6,168 | 6,148
Share-based compensation |  |  |  |  |  |  |  |  |  | 2,695 | 2,208 | 2,179
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 173,912 | 162,836 | 144,356
Assets | [1] | 2,298,238 |  |  |  | 2,684,717 |  |  |  | 2,298,238 | 2,684,717 | 2,391,512
Corporate and Other Distributed Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 121,567 | 124,131 | 128,081
Net investment income |  |  |  |  |  |  |  |  |  | 67,683 | 69,086 | 71,391
Amortization of deferred policy acquisition costs |  |  |  |  |  |  |  |  |  | 1,351 | 1,480 | 1,622
Share-based compensation |  |  |  |  |  |  |  |  |  | 10,421 | 10,397 | 8,611
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | (39,732) | (28,973) | (20,122)
Assets |  | $ 3,974,255 |  |  |  | $ 3,570,149 |  |  |  | $ 3,974,255 | $ 3,570,149 | $ 3,101,929
[1] | The Investment and Savings Products segment includes assets held in separate accounts. Excluding separate accounts, the Investment and Savings Products segment assets were $102.8 million, $112.0 million, and $103.7 million as of December 31, 2018, 2017, and 2016, respectively.

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