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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
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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).

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