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Reinsurance - In-force Life Insurance (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Reinsurance Disclosures [Abstract]    
Direct life insurance in force $ 725,613,934 $ 696,884,429
Amounts ceded to other companies (638,417,864) (616,252,839)
Net life insurance in force $ 87,196,070 $ 80,631,590
Percentage of reinsured life insurance in force 88.00% 88.00%