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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Effects of Reinsurance [Line Items]    
Maximum Life Insurance Retention Per Individual Life $ 8,000  
Reinsurance ceded receivables 757,572 $ 782,027
Reinsurance Claims Recoverables 242,800 243,800
Claims Recoverable From Retrocessionaires Past Due 17,400 1,900
Statutory Financial Reinsurance 18,100,000 16,200,000
Statutory Reserves Related To Financial Requirements 3,421,000 2,901,100
Assets Held-in-trust 767,900 841,500
Benefit Of RGA Subsidiaries [Member]    
Effects of Reinsurance [Line Items]    
Assets Held-in-trust 2,910,200 2,214,100
Benefit Of Third Parties [Member]    
Effects of Reinsurance [Line Items]    
Assets Held-in-trust $ 20,072,700 $ 15,584,300
AM Best, A- Rating [Member]    
Effects of Reinsurance [Line Items]    
Retrocession Pool Participants Minimum AM Best Rating “A- (excellent)” “A- (excellent)”
AM Best, B+ Rating [Member]    
Effects of Reinsurance [Line Items]    
Retrocession Pool Participants Minimum AM Best Rating B+