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Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 1,985,890 | [1] | $ 1,927,842 | [2]
Equity securities | 39,842 |  |  |
Available-for-sale equity securities, at fair value |  |  | 41,107 |
Trading securities | $ 23,079 |  | 6,228 |
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 | $ 1,985,890 |  | 1,927,842 |
Equity securities | 39,842 |  |  |
Available-for-sale equity securities, at fair value |  |  | 41,107 |
Trading securities | 23,079 |  | 6,228 |
Assets, fair value disclosure | 4,437,818 |  | 4,548,049 |
Liabilities, fair value disclosure | 2,389,007 |  | 2,572,872 |
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 | 11,714 |  | 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 | 151,047 |  | 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 | 55,631 |  | 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 | 1,390,526 |  | 1,376,282 |
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 | 161,382 |  | 122,958 |
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 | 136,143 |  | 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 | 79,447 |  | 80,781 |
Fair Value, Recurring Measurements [Member] | Separate Accounts Assets, Fair Value Disclosure [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Separate accounts assets | 2,389,007 |  | 2,572,872 |
Fair Value, Recurring Measurements [Member] | Separate Accounts Liabilities [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Separate accounts liabilities | 2,389,007 |  | 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 | 3,130 |  | 3,240 |
Equity securities | 37,350 |  |  |
Available-for-sale equity securities, at fair value |  |  | 39,026 |
Trading securities |  |  | 1,428 |
Assets, fair value disclosure | 40,480 |  | 43,694 |
Fair Value, Recurring Measurements [Member] | Level 1 [Member] | Corporates [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 3,130 |  | 3,240 |
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 | 1,982,438 |  | 1,924,185 |
Equity securities | 2,298 |  |  |
Available-for-sale equity securities, at fair value |  |  | 1,931 |
Trading securities | 23,079 |  | 4,800 |
Assets, fair value disclosure | 4,396,822 |  | 4,503,788 |
Liabilities, fair value disclosure | 2,389,007 |  | 2,572,872 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | U.S. Government and Agencies [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 11,714 |  | 11,813 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | Foreign Government [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 151,047 |  | 144,489 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | States and Political Subdivisions [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 55,631 |  | 56,127 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | Corporates [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 1,387,393 |  | 1,373,039 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 161,063 |  | 122,544 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | Commercial Mortgage-backed Securities [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 136,143 |  | 135,392 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | Other Asset-backed Securities [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | 79,447 |  | 80,781 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | Separate Accounts Assets, Fair Value Disclosure [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Separate accounts assets | 2,389,007 |  | 2,572,872 |
Fair Value, Recurring Measurements [Member] | Level 2 [Member] | Separate Accounts Liabilities [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Separate accounts liabilities | 2,389,007 |  | 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 | 322 |  | 417 |
Equity securities | 194 |  |  |
Available-for-sale equity securities, at fair value |  |  | 150 |
Assets, fair value disclosure | 516 |  | 567 |
Fair Value, Recurring Measurements [Member] | Level 3 [Member] | Corporates [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] | Level 3 [Member] | Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Total available-for-sale fixed-maturity securities | $ 319 |  | $ 414 |
[1] | Includes $0.2 million of other-than-temporary impairment ("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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