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Fair Value Measurements - Recurring not carried at FV (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets    
Mortgage loans on real estate $ 4,365,189 $ 4,005,187
Policy loans 4,103,408 4,104,094
Liabilities    
Policyholders’ funds 239,576 280,578
Commercial paper 99,692 99,886
Carrying amount    
Assets    
Limited partnership interests (1) 0 43,281
Carrying amount | Level 2    
Assets    
Mortgage loans on real estate 4,365,189 4,005,187
Policy loans 4,103,408 4,104,094
Liabilities    
Annuity contract benefits without life contingencies 12,882,915 12,704,401
Policyholders’ funds 239,576 280,578
Commercial paper 99,692 99,886
Notes payable 564,119 543,338
Carrying amount | Level 3    
Assets    
Other investments 10,840 11,507
Estimated fair value    
Assets    
Limited partnership interests (1) 0 45,009
Estimated fair value | Level 2    
Assets    
Mortgage loans on real estate 4,254,101 4,066,800
Policy loans 4,103,408 4,104,094
Liabilities    
Annuity contract benefits without life contingencies 12,503,021 12,647,309
Policyholders’ funds 239,576 280,578
Commercial paper 99,692 99,886
Notes payable 612,828 581,097
Estimated fair value | Level 3    
Assets    
Other investments $ 40,387 $ 41,588