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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
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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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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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