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Fair Value of Financial Instruments - Schedule of Financial Instruments Measured on Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets    
Mortgage loans $ 16,831 $ 1,252
Policy loans 18,247 18,476
Other invested assets 62,363 53,119
Nonrecurring | Level 1    
Assets    
Mortgage loans 0 0
Policy loans 0 0
Other invested assets 0 0
Total assets not accounted for at fair value 0 0
Liabilities    
Annuity benefits accumulated 0 0
Long-term obligations 0 0
Total liabilities not accounted for at fair value 0 0
Nonrecurring | Level 2    
Assets    
Mortgage loans 0 0
Policy loans 18,247 18,476
Other invested assets 0 0
Total assets not accounted for at fair value 18,247 18,476
Liabilities    
Annuity benefits accumulated 0 0
Long-term obligations 376,081 310,307
Total liabilities not accounted for at fair value 376,081 310,307
Nonrecurring | Level 3    
Assets    
Mortgage loans 16,832 1,252
Policy loans 0 0
Other invested assets 4,597 3,434
Total assets not accounted for at fair value 21,429 4,686
Liabilities    
Annuity benefits accumulated 249,372 258,847
Long-term obligations 0 0
Total liabilities not accounted for at fair value 249,372 258,847
Nonrecurring | Carrying Value    
Assets    
Mortgage loans 16,831 1,252
Policy loans 18,247 18,476
Other invested assets 5,719 5,784
Total assets not accounted for at fair value 40,797 25,512
Liabilities    
Annuity benefits accumulated 251,270 257,454
Long-term obligations 378,780 319,180
Total liabilities not accounted for at fair value 630,050 576,634
Nonrecurring | Estimated Fair Value    
Assets    
Mortgage loans 16,832 1,252
Policy loans 18,247 18,476
Other invested assets 4,597 3,434
Total assets not accounted for at fair value 39,676 23,162
Liabilities    
Annuity benefits accumulated 249,372 258,847
Long-term obligations 376,081 310,307
Total liabilities not accounted for at fair value $ 625,453 $ 569,154