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Fair Value of Financial Instruments - Measured on Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets    
Mortgage loans $ 87,308 $ 52,109
Policy loans 20,324 17,944
Other invested assets 70,965 85,419
Nonrecurring | Level 1    
Assets    
Mortgage loans 0 0
Policy loans 0 0
Other invested assets 0 0
Total assets 0 0
Liabilities    
Annuity benefits accumulated 0 0
Debt obligations 0 0
Total liabilities 0 0
Nonrecurring | Level 2    
Assets    
Mortgage loans 0 0
Policy loans 20,324 17,944
Other invested assets 0 0
Total assets 20,324 17,944
Liabilities    
Annuity benefits accumulated 0 0
Debt obligations 663,383 552,413
Total liabilities 663,383 552,413
Nonrecurring | Level 3    
Assets    
Mortgage loans 0 52,110
Policy loans 0 0
Other invested assets 1,600 3,757
Total assets 1,600 55,867
Liabilities    
Annuity benefits accumulated 241,688 240,361
Debt obligations 0 0
Total liabilities 241,688 240,361
Nonrecurring | Carrying Value    
Assets    
Mortgage loans 87,308 52,109
Policy loans 20,324 17,944
Other invested assets 1,600 2,906
Total assets 109,232 72,959
Liabilities    
Annuity benefits accumulated 244,021 243,156
Debt obligations 660,041 544,211
Total liabilities 904,062 787,367
Nonrecurring | Estimated Fair Value    
Assets    
Mortgage loans 0 52,110
Policy loans 20,324 17,944
Other invested assets 1,600 3,757
Total assets 21,924 73,811
Liabilities    
Annuity benefits accumulated 241,688 240,361
Debt obligations 663,383 552,413
Total liabilities $ 905,071 $ 792,774