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Fair Value Recurring not carried at FV (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Assets    
Mortgage loans on real estate $ 3,247,704 $ 3,363,570
Policy loans 4,092,661 4,130,062
Liabilities    
Policyholders’ funds 299,577 335,484
Commercial paper $ 93,371 98,589
Notice required to change policyholders' funds interest crediting rate 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 $ 3,247,704 3,363,570
Policy loans 4,092,661 4,130,062
Limited partnership interests 35,039 38,796
Other investments 14,596 15,614
Liabilities    
Annuity contract benefits without life contingencies 11,104,721 10,569,147
Policyholders’ funds 299,577 335,484
Commercial paper 93,371 98,589
Notes payable 532,575 532,547
Estimated fair value    
Assets    
Mortgage loans on real estate 3,362,496 3,558,111
Policy loans 4,092,661 4,130,062
Limited partnership interests 34,882 41,853
Other investments 44,723 43,263
Liabilities    
Annuity contract benefits without life contingencies 10,839,205 10,563,477
Policyholders’ funds 299,577 335,484
Commercial paper 93,371 98,589
Notes payable $ 563,633 $ 564,904