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Fair Value Measurements - Financial Instruments and Investments Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets    
Mortgage loans on real estate $ 4,005,187 $ 3,558,826
Policy loans 4,104,094 4,019,648
Liabilities    
Policyholders’ funds 280,578 285,554
Commercial paper 99,886 99,049
Carrying amount    
Assets    
Mortgage loans on real estate 4,005,187 3,558,826
Policy loans 4,104,094 4,019,648
Limited partnership interests 43,281 29,345
Other investments 11,507 14,382
Liabilities    
Annuity contract benefits without life contingencies 12,704,401 12,291,378
Policyholders’ funds 280,578 285,554
Commercial paper 99,886 99,049
Notes payable 543,338 531,092
Estimated fair value    
Assets    
Mortgage loans on real estate 4,066,800 3,574,240
Policy loans 4,104,094 4,019,648
Limited partnership interests 45,009 29,822
Other investments 41,588 44,687
Liabilities    
Annuity contract benefits without life contingencies 12,647,309 12,129,631
Policyholders’ funds 280,578 285,554
Commercial paper 99,886 99,049
Notes payable $ 581,097 $ 495,004