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Reinsurance - In-force Life Insurance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reinsurance Disclosures [Abstract]      
Direct life insurance in force $ 783,979,673 $ 767,001,938 $ 731,822,070
Amounts ceded to other companies (682,708,797) (668,446,638) (643,364,460)
Net life insurance in force $ 101,270,876 $ 98,555,300 $ 88,457,610
Percentage of reinsured life insurance in force 87.00% 87.00%