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Fair Value Measurements - Recurring not carried at FV (Details 4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Assets    
Mortgage loans on real estate $ 3,844,931 $ 3,558,826
Policy loans 4,016,844 4,019,648
Liabilities    
Policyholders’ funds 241,167 285,554
Commercial paper $ 98,645 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 $ 3,844,931 3,558,826
Policy loans 4,016,844 4,019,648
Limited partnership interests 32,579 29,345
Other investments 13,935 14,382
Liabilities    
Annuity contract benefits without life contingencies 12,383,984 12,291,378
Policyholders’ funds 241,167 285,554
Commercial paper 98,645 99,049
Notes payable 534,339 531,092
Estimated fair value    
Assets    
Mortgage loans on real estate 3,915,687 3,574,240
Policy loans 4,016,844 4,019,648
Limited partnership interests 31,947 29,822
Other investments 44,243 44,687
Liabilities    
Annuity contract benefits without life contingencies 12,249,498 12,129,631
Policyholders’ funds 241,167 285,554
Commercial paper 98,645 99,049
Notes payable $ 528,415 $ 495,004