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Segment and Geographical Information - Summary of Assets and Profit or Loss by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | $ 467,815 | $ 413,696 | $ 927,737 | $ 818,860 |
Net investment income |  | 20,030 | 19,742 | 39,047 | 39,636 |
Amortization of deferred policy acquisition costs |  | 53,847 | 47,861 | 114,011 | 99,710 |
Share-based compensation |  | 1,891 | 1,923 | 13,392 | 11,667 |
Income (loss) before income taxes |  | 113,765 | 96,389 | 196,727 | 171,230 |
Assets |  | 12,496,641 |  | 12,496,641 |  | $ 12,460,703
Term Life Insurance Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 272,978 | 238,901 | 543,286 | 472,953 |
Net investment income |  | 3,246 | 2,347 | 6,334 | 4,650 |
Amortization of deferred policy acquisition costs |  | 51,257 | 44,937 | 107,930 | 95,070 |
Share-based compensation |  | 793 | 301 | 2,966 | 2,077 |
Income (loss) before income taxes |  | 75,828 | 61,854 | 135,448 | 110,877 |
Assets |  | 6,307,722 |  | 6,307,722 |  | 6,205,837
Investment and Savings Products Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 162,841 | 143,774 | 324,883 | 284,180 |
Amortization of deferred policy acquisition costs |  | 2,080 | 2,310 | 5,521 | 4,044 |
Share-based compensation |  | 325 | 361 | 1,518 | 1,541 |
Income (loss) before income taxes |  | 43,227 | 39,684 | 83,214 | 76,803 |
Assets | [1] | 2,512,547 |  | 2,512,547 |  | 2,684,717
Corporate and Other Distributed Products Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 31,996 | 31,021 | 59,568 | 61,727 |
Net investment income |  | 16,784 | 17,395 | 32,713 | 34,986 |
Amortization of deferred policy acquisition costs |  | 510 | 614 | 560 | 596 |
Share-based compensation |  | 773 | 1,261 | 8,908 | 8,049 |
Income (loss) before income taxes |  | (5,290) | $ (5,149) | (21,935) | $ (16,450) |
Assets |  | $ 3,676,372 |  | $ 3,676,372 |  | $ 3,570,149
[1] | The Investment and Savings Products segment includes assets held in separate accounts. Excluding separate accounts, the Investment and Savings Products segment assets were $123.6 million and $112.0 million as of June 30, 2018 and December 31, 2017, respectively.

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