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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

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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