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Fair Value Measurements - Recurring not carried at FV (Details 5) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Assets    
Mortgage loans on real estate $ 3,324,597 $ 3,363,570
Policy loans 4,150,476 4,130,062
Liabilities    
Policyholders’ funds 266,438 335,484
Commercial paper $ 96,284 98,589
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  
Fair Value, Inputs, Level 2 | Carrying amount    
Assets    
Mortgage loans on real estate $ 3,324,597 3,363,570
Policy loans 4,150,476 4,130,062
Other investments 14,760 15,614
Liabilities    
Annuity contract benefits without life contingencies 10,897,078 10,569,147
Policyholders’ funds 266,438 335,484
Commercial paper 96,284 98,589
Notes payable 541,826 532,547
Fair Value, Inputs, Level 2 | Estimated fair value    
Assets    
Mortgage loans on real estate 3,502,107 3,558,111
Policy loans 4,150,476 4,130,062
Other investments 44,591 43,263
Liabilities    
Annuity contract benefits without life contingencies 10,746,275 10,563,477
Policyholders’ funds 266,438 335,484
Commercial paper 96,284 98,589
Notes payable 569,320 564,904
Significant unobservable inputs (Level 3) | Carrying amount    
Assets    
Limited partnership interests 36,474 38,796
Significant unobservable inputs (Level 3) | Estimated fair value    
Assets    
Limited partnership interests $ 37,339 $ 41,853