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Fair Value Measurements - Recurring not carried at FV (Details 5) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Assets    
Mortgage loans on real estate $ 3,495,837 $ 3,247,704
Policy loans 4,113,952 4,092,661
Liabilities    
Policyholders’ funds 289,666 299,577
Commercial paper $ 99,669 93,371
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 $ 3,495,837 3,247,704
Policy loans 4,113,952 4,092,661
Limited partnership interests 29,905 35,039
Other investments 14,295 14,596
Liabilities    
Annuity contract benefits without life contingencies 11,838,861 11,104,721
Policyholders’ funds 289,666 299,577
Commercial paper 99,669 93,371
Notes payable 530,956 532,575
Estimated fair value    
Assets    
Mortgage loans on real estate 3,699,863 3,362,496
Policy loans 4,113,952 4,092,661
Limited partnership interests 29,140 34,882
Other investments 44,723 44,723
Liabilities    
Annuity contract benefits without life contingencies 11,967,170 10,839,205
Policyholders’ funds 289,666 299,577
Commercial paper 99,669 93,371
Notes payable $ 527,132 $ 563,633