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Reinsurance - In-force Life Insurance (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Reinsurance Disclosures [Abstract]    
Direct life insurance in force $ 776,662,402 $ 767,001,938
Amounts ceded to other companies (677,001,612) (668,446,638)
Net life insurance in force $ 99,660,790 $ 98,555,300
Percentage of reinsured life insurance in force 87.00% 87.00%