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Fair Value Measurements - Financial Instruments and Investments Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets    
Mortgage loans on real estate $ 3,558,826 $ 3,247,704
Policy loans 4,019,648 4,092,661
Liabilities    
Policyholders’ funds 285,554 299,577
Commercial paper 99,049 93,371
Carrying amount    
Assets    
Mortgage loans on real estate 3,558,826 3,247,704
Policy loans 4,019,648 4,092,661
Limited partnership interests 29,345 35,039
Other investments 14,382 14,596
Liabilities    
Annuity contract benefits without life contingencies 12,291,378 11,104,721
Policyholders’ funds 285,554 299,577
Commercial paper 99,049 93,371
Notes payable 531,092 532,575
Estimated fair value    
Assets    
Mortgage loans on real estate 3,574,240 3,362,496
Policy loans 4,019,648 4,092,661
Limited partnership interests 29,822 34,882
Other investments 44,687 44,723
Liabilities    
Annuity contract benefits without life contingencies 12,129,631 10,839,205
Policyholders’ funds 285,554 299,577
Commercial paper 99,049 93,371
Notes payable $ 495,004 $ 563,633