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Fair Value Measurements - Recurring not carried at FV (Details 4) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Assets    
Mortgage loans on real estate $ 3,924,598 $ 3,558,826
Policy loans 4,066,620 4,019,648
Liabilities    
Policyholders’ funds 287,265 285,554
Commercial paper $ 71,253 99,049
Policyholders' funds, notice required to change policyholders' funds interest crediting rate (in days) 30 days  
Minimum    
Liabilities    
Limited partnership interests, Estimated liquidation period of underlying assets of the funds 1 year  
Maximum    
Liabilities    
Limited partnership interests, Estimated liquidation period of underlying assets of the funds 10 years  
Carrying amount    
Assets    
Mortgage loans on real estate $ 3,924,598 3,558,826
Policy loans 4,066,620 4,019,648
Limited partnership interests 32,991 29,345
Other investments 13,603 14,382
Liabilities    
Annuity contract benefits without life contingencies 12,419,039 12,291,378
Policyholders’ funds 287,265 285,554
Commercial paper 71,253 99,049
Notes payable 531,220 531,092
Estimated fair value    
Assets    
Mortgage loans on real estate 4,020,537 3,574,240
Policy loans 4,066,620 4,019,648
Limited partnership interests 31,944 29,822
Other investments 43,799 44,687
Liabilities    
Annuity contract benefits without life contingencies 12,314,755 12,129,631
Policyholders’ funds 287,265 285,554
Commercial paper 71,253 99,049
Notes payable $ 563,615 $ 495,004