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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value for Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value		$ 1,808,713	$ 1,779,298
Fixed-maturity securities held to maturity, fair value		500,823	371,742
Trading securities		12,259	5,358
Surplus note		453,247	364,424
Fixed-maturity securities held to maturity		454,000	365,220
Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading securities		12,259	5,358
Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading securities		12,259	5,358
Separate Accounts Assets, Fair Value Disclosure [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts assets		2,347,816	2,063,899
Separate Accounts Assets, Fair Value Disclosure [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts assets		2,347,816	2,063,899
Reported Value Measurement [Member] | Fair Value, Recurring Measurements [Member] | Fixed-maturity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value		1,761,174	1,731,459
Reported Value Measurement [Member] | Fair Value, Recurring Measurements [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value		47,539	47,839
Reported Value Measurement [Member] | Level 3 [Member] | Fair value, Nonrecurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Policy loans		30,801	28,627
Surplus note	[1]	453,247	364,424
Fixed-maturity securities held to maturity		454,000	365,220
Reported Value Measurement [Member] | Level 3 [Member] | Fair value, Nonrecurring Measurements [Member] | Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Deposit asset underlying 10% coinsurance agreement		198,275	181,889
Reported Value Measurement [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading securities		12,259	5,358
Reported Value Measurement [Member] | Separate Accounts Assets, Fair Value Disclosure [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts assets		2,347,816	2,063,899
Reported Value Measurement [Member] | Senior Notes [Member] | Level 2 [Member] | Fair value, Nonrecurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notes payable	[1]	372,827	372,552
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring Measurements [Member] | Fixed-maturity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value		1,761,174	1,731,459
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring Measurements [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value		47,539	47,839
Estimate of Fair Value Measurement [Member] | Level 3 [Member] | Fair value, Nonrecurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed-maturity securities held to maturity, fair value		500,823	371,742
Policy loans		30,801	28,627
Surplus note	[1]	498,256	371,498
Estimate of Fair Value Measurement [Member] | Level 3 [Member] | Fair value, Nonrecurring Measurements [Member] | Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Deposit asset underlying 10% coinsurance agreement		198,275	181,889
Estimate of Fair Value Measurement [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading securities		12,259	5,358
Estimate of Fair Value Measurement [Member] | Separate Accounts Assets, Fair Value Disclosure [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts assets		2,347,816	2,063,899
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Level 2 [Member] | Fair value, Nonrecurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notes payable	[1]	410,296	398,649
Separate Accounts Liabilities [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts liabilities		2,347,816	2,063,899
Separate Accounts Liabilities [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts liabilities		2,347,816	2,063,899
Separate Accounts Liabilities [Member] | Reported Value Measurement [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts liabilities		2,347,816	2,063,899
Separate Accounts Liabilities [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member] | Fair Value, Recurring Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate accounts liabilities		$ 2,347,816	$ 2,063,899
[1] Carrying value amounts shown are net of issuance costs.

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Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer.

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