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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.