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Fair Value Measurements - Fair Value Measurements - Recurring not carried at FV (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Assets    
Mortgage loans on real estate $ 3,943,088 $ 3,558,826
Policy loans 4,073,511 4,019,648
Liabilities    
Policyholders’ funds 245,007 285,554
Commercial paper $ 99,868 99,049
Policyholders' funds, notice required to change policyholders' funds interest crediting rate (in days) 30 days  
Minimum    
Liabilities    
Estimated liquidation period of underlying assets of the funds 1 year  
Maximum    
Liabilities    
Estimated liquidation period of underlying assets of the funds 10 years  
Carrying amount    
Assets    
Mortgage loans on real estate $ 3,943,088 3,558,826
Policy loans 4,073,511 4,019,648
Limited partnership interests 40,433 29,345
Other investments 12,631 14,382
Liabilities    
Annuity contract benefits without life contingencies 12,669,339 12,291,378
Policyholders’ funds 245,007 285,554
Commercial paper 99,868 99,049
Notes payable 534,538 531,092
Estimated fair value    
Assets    
Mortgage loans on real estate 4,020,555 3,574,240
Policy loans 4,073,511 4,019,648
Limited partnership interests 40,413 29,822
Other investments 43,002 44,687
Liabilities    
Annuity contract benefits without life contingencies 12,641,064 12,129,631
Policyholders’ funds 245,007 285,554
Commercial paper 99,868 99,049
Notes payable $ 565,903 $ 495,004