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Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, at fair value $ 2,069,635 [1] $ 1,927,842 [2]
Fixed-maturity security held to maturity, fair value 945,331 779,472
Available-for-sale short-term investments 8,171  
Available-for-sale equity securities, at fair value   41,107
Equity securities 37,679  
Trading securities 13,610 6,228
Separate accounts assets 2,195,501 2,572,872
Surplus note 969,685 736,381
Separate accounts liabilities 2,195,501 2,572,872
Reported Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, at fair value 2,069,635 1,927,842
Fixed-maturity security held to maturity, fair value [3] 970,390 737,150
Available-for-sale short-term investments 8,171  
Available-for-sale equity securities, at fair value   41,107
Equity securities 37,679  
Trading securities 13,610 6,228
Policy loans [3] 31,501 32,816
Separate accounts assets 2,195,501 2,572,872
Surplus note [3],[4] 969,685 736,381
Separate accounts liabilities 2,195,501 2,572,872
Reported Value Measurement [Member] | Deposits [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Deposit asset underlying 10% coinsurance agreement [3] 228,974 217,336
Reported Value Measurement [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Notes payable [4],[5] 373,661 373,288
Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, at fair value 2,069,635 1,927,842
Available-for-sale short-term investments 8,171  
Available-for-sale equity securities, at fair value   41,107
Equity securities 37,679  
Trading securities 13,610 6,228
Separate accounts assets 2,195,501 2,572,872
Separate accounts liabilities 2,195,501 2,572,872
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed-maturity security held to maturity, fair value [3] 945,331 779,472
Policy loans [3] 31,501 32,816
Surplus note [3],[4] 945,331 778,050
Estimate of Fair Value Measurement [Member] | Deposits [Member] | Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Deposit asset underlying 10% coinsurance agreement [3] 228,974 217,336
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Notes payable [4],[5] $ 384,909 $ 400,628
[1] Includes $0.1 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).
[2] Includes $0.2 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).
[3] Classified as level 3 fair value measurement.
[4] Carrying value amounts shown are net of issuance costs.
[5] Classified as level 2 fair value measurement.