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Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities $ 2,069,635 [1] $ 1,927,842 [2]
Available-for-sale equity securities, at fair value   41,107
Short Term Investments 8,171  
Total Available-For-Sale Securities 2,077,806 1,968,949
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
Fair value assumptions, percentage of securities assessed by third-party pricing service 94.00%  
Fair Value, Recurring Measurements [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities $ 2,069,635 1,927,842
Available-for-sale equity securities, at fair value   41,107
Short Term Investments 8,171  
Total Available-For-Sale Securities 2,077,806  
Equity securities 37,679  
Trading securities 13,610 6,228
Separate accounts assets 2,195,501 2,572,872
Assets, fair value disclosure 4,324,596 4,548,049
Separate accounts liabilities 2,195,501 2,572,872
Liabilities, fair value disclosure 2,195,501 2,572,872
Fair Value, Recurring Measurements [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 2,869 3,240
Available-for-sale equity securities, at fair value   39,026
Total Available-For-Sale Securities 2,869  
Equity securities 36,473  
Trading securities   1,428
Assets, fair value disclosure 39,342 43,694
Fair Value, Recurring Measurements [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 2,066,031 1,924,185
Available-for-sale equity securities, at fair value   1,931
Short Term Investments 8,171  
Total Available-For-Sale Securities 2,074,202  
Equity securities 1,020  
Trading securities 13,610 4,800
Separate accounts assets 2,195,501 2,572,872
Assets, fair value disclosure 4,284,333 4,503,788
Separate accounts liabilities 2,195,501 2,572,872
Liabilities, fair value disclosure 2,195,501 2,572,872
Fair Value, Recurring Measurements [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 735 417
Available-for-sale equity securities, at fair value   150
Total Available-For-Sale Securities 735  
Equity securities 186  
Assets, fair value disclosure 921 567
Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 12,233 11,813
Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 12,233 11,813
Fair Value, Recurring Measurements [Member] | Foreign Government [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 158,112 144,489
Fair Value, Recurring Measurements [Member] | Foreign Government [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 158,112 144,489
Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 60,006 56,127
Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 60,006 56,127
Fair Value, Recurring Measurements [Member] | Corporates [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 1,434,218 1,376,282
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 2,869 3,240
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 1,431,346 1,373,039
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 3 3
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 191,951 122,958
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 191,720 122,544
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 231 414
Fair Value, Recurring Measurements [Member] | Commercial Mortgage-backed Securities [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 131,355 135,392
Fair Value, Recurring Measurements [Member] | Commercial Mortgage-backed Securities [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 131,355 135,392
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 81,760 80,781
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities 81,259 $ 80,781
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total available-for-sale fixed-maturity securities $ 501  
[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).