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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.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of liability for variable contracts that meet specified criteria that are backed by assets held in separate accounts and carried at the fair value of those assets.

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