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Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale debt securities, at fair value |  | $ 1,985,890 | [1] | $ 1,927,842 | [2]
Fixed-maturity security held to maturity, fair value |  | 838,637 |  | 779,472 |
Available-for-sale equity securities, at fair value |  |  |  | 41,107 |
Equity securities |  | 39,842 |  |  |
Trading securities |  | 23,079 |  | 6,228 |
Surplus note |  | 843,073 |  | 736,381 |
Fixed-maturity security (held-to-maturity) |  | 843,810 |  | 737,150 |
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 |  | 1,985,890 |  | 1,927,842 |
Available-for-sale equity securities, at fair value |  |  |  | 41,107 |
Equity securities |  | 39,842 |  |  |
Trading securities |  | 23,079 |  | 6,228 |
Reported Value Measurement [Member] | Level 3 [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Policy loans | [3] | 30,954 |  | 32,816 |
Surplus note | [3],[4] | 843,073 |  | 736,381 |
Fixed-maturity security (held-to-maturity) | [3] | 843,810 |  | 737,150 |
Reported Value Measurement [Member] | Level 3 [Member] | Deposits [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Deposit asset underlying 10% coinsurance agreement | [3] | 223,105 |  | 217,336 |
Reported Value Measurement [Member] | Separate Accounts Assets, Fair Value Disclosure [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Separate accounts assets |  | 2,389,007 |  | 2,572,872 |
Reported 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] | 373,474 |  | 373,288 |
Reported Value Measurement [Member] | Separate Accounts Liabilities [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Separate accounts liabilities |  | 2,389,007 |  | 2,572,872 |
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 |  | 1,985,890 |  | 1,927,842 |
Available-for-sale equity securities, at fair value |  |  |  | 41,107 |
Equity securities |  | 39,842 |  |  |
Trading securities |  | 23,079 |  | 6,228 |
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] | 838,637 |  | 779,472 |
Policy loans | [3] | 30,954 |  | 32,816 |
Surplus note | [3],[4] | 838,459 |  | 778,050 |
Estimate of Fair Value Measurement [Member] | Level 3 [Member] | Deposits [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Deposit asset underlying 10% coinsurance agreement | [3] | 223,105 |  | 217,336 |
Estimate of Fair Value Measurement [Member] | Separate Accounts Assets, Fair Value Disclosure [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Separate accounts assets |  | 2,389,007 |  | 2,572,872 |
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] | 384,401 |  | 400,628 |
Estimate of Fair Value Measurement [Member] | Separate Accounts Liabilities [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Separate accounts liabilities |  | $ 2,389,007 |  | $ 2,572,872 |
[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).
[3] | Classified as a level 3 fair value measurement.
[4] | Carrying value amounts shown are net of issuance costs
[5] | Classified as a level 2 fair value measurement.

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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