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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Revenues $ 413,696 $ 378,994 $ 818,860 $ 741,593  
Net investment income 19,742 20,389 39,636 41,627  
Amortization of DAC 47,861 38,720 99,710 81,849  
Non-cash share-based compensation expense 1,923 2,549 11,667 10,031  
Income (loss) before income taxes 96,389 91,880 171,230 162,092  
Assets 11,945,298   11,945,298   $ 11,438,943
Term Life Insurance Segment [Member]          
Segment Reporting Information [Line Items]          
Revenues 238,901 210,559 472,953 416,655  
Net investment income 2,347 1,871 4,650 3,721  
Amortization of DAC 44,937 36,477 95,070 77,702  
Non-cash share-based compensation expense 301 349 2,077 1,982  
Income (loss) before income taxes 61,854 58,018 110,877 104,098  
Assets 6,066,410   6,066,410   5,945,502
Investment and Savings Products Segment [Member]          
Segment Reporting Information [Line Items]          
Revenues 143,774 132,608 284,180 257,525  
Amortization of DAC 2,310 1,704 4,044 3,623  
Non-cash share-based compensation expense 361 347 1,541 1,503  
Income (loss) before income taxes 39,684 36,064 76,803 67,755  
Assets [1] 2,537,909   2,537,909   2,391,512
Corporate and Other Distributed Products Segment [Member]          
Segment Reporting Information [Line Items]          
Revenues 31,021 35,827 61,727 67,413  
Net investment income 17,395 18,518 34,986 37,906  
Amortization of DAC 614 539 596 524  
Non-cash share-based compensation expense 1,261 1,853 8,049 6,546  
Income (loss) before income taxes (5,149) $ (2,202) (16,450) $ (9,761)  
Assets $ 3,340,979   $ 3,340,979   $ 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 approximately $113.1 million and $103.7 million as of June 30, 2017 and December 31, 2016, respectively.