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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs $ 2,133,920 $ 1,951,892  
Liability for future policy benefits, losses, claims and loss expense reserves 6,168,157 5,954,524  
Unearned and advance premiums 15,587 15,423  
Other policyholders' funds 313,862 307,401  
Separate account liabilities 2,195,501 2,572,872  
Premium revenue 1,085,940 961,338 $ 843,709
Net investment income 81,430 79,017 79,025
Benefits, claims, losses and settlement expense 457,583 416,019 367,655
Amortization of deferred policy acquisition costs 239,730 209,399 180,582
Other operating expense 786,446 684,164 633,252
Premiums written 792 821 844
Term Life Insurance [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 2,052,176 1,861,253  
Liability for future policy benefits, losses, claims and loss expense reserves 5,963,707 5,747,317  
Unearned and advance premiums 15,016 14,795  
Other policyholders' funds 303,866 299,265  
Premium revenue 1,067,079 941,057 822,207
Net investment income 13,747 9,931 7,634
Benefits, claims, losses and settlement expense 441,775 398,212 350,640
Amortization of deferred policy acquisition costs 228,613 201,751 172,812
Other operating expense 170,908 146,604 129,569
Investment and Savings Products [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 56,548 64,419  
Separate account liabilities 2,195,409 2,572,766  
Amortization of deferred policy acquisition costs 9,766 6,168 6,148
Other operating expense 471,398 403,743 374,117
Corporate and Other Distributed Products Segment [Member]      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred policy acquisition costs 25,196 26,220  
Liability for future policy benefits, losses, claims and loss expense reserves 204,450 207,207  
Unearned and advance premiums 571 628  
Other policyholders' funds 9,996 8,136  
Separate account liabilities 92 106  
Premium revenue 18,861 20,281 21,502
Net investment income 67,683 69,086 71,391
Benefits, claims, losses and settlement expense 15,808 17,807 17,015
Amortization of deferred policy acquisition costs 1,351 1,480 1,622
Other operating expense 144,140 133,817 129,566
Premiums written $ 792 $ 821 $ 844