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Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | $ 1,808,713 | $ 1,779,298
Trading securities | $ 12,259 | 5,358
Fair value assumptions, percentage of securities assessed by third-party pricing service | 95.00% |
Fair Value, Recurring Measurements [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Trading securities | $ 12,259 | 5,358
Assets, fair value disclosure, recurring | 4,168,788 | 3,848,555
Liabilities, fair value disclosure, recurring | 2,347,816 | 2,063,899
Fair Value, Recurring Measurements [Member] | Level 1 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure, recurring | 45,195 | 43,487
Fair Value, Recurring Measurements [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Trading securities | 12,259 | 5,358
Assets, fair value disclosure, recurring | 4,117,031 | 3,804,285
Liabilities, fair value disclosure, recurring | 2,347,816 | 2,063,899
Fair Value, Recurring Measurements [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Assets, fair value disclosure, recurring | 6,562 | 783
Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 16,061 | 20,659
Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 16,061 | 20,659
Fair Value, Recurring Measurements [Member] | Foreign Government [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 131,730 | 120,216
Fair Value, Recurring Measurements [Member] | Foreign Government [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 131,730 | 120,216
Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 46,459 | 40,565
Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 46,459 | 40,565
Fair Value, Recurring Measurements [Member] | Corporates [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 1,323,080 | 1,301,762
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 1 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 3,374 | 2,146
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 1,317,982 | 1,299,613
Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 1,724 | 3
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 85,278 | 101,225
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 83,984 | 100,493
Fair Value, Recurring Measurements [Member] | Residential Mortgage-backed Securities [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 1,294 | 732
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 49,791 | 47,046
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 46,321 | 47,046
Fair Value, Recurring Measurements [Member] | Other Asset-backed Securities [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 3,470 |
Fair Value, Recurring Measurements [Member] | Commercial Mortgage-backed Securities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 108,775 | 99,986
Fair Value, Recurring Measurements [Member] | Commercial Mortgage-backed Securities [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 108,775 | 99,986
Fair Value, Recurring Measurements [Member] | Fixed-maturity Securities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 1,761,174 | 1,731,459
Fair Value, Recurring Measurements [Member] | Fixed-maturity Securities [Member] | Level 1 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 3,374 | 2,146
Fair Value, Recurring Measurements [Member] | Fixed-maturity Securities [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 1,751,312 | 1,728,578
Fair Value, Recurring Measurements [Member] | Fixed-maturity Securities [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 6,488 | 735
Fair Value, Recurring Measurements [Member] | Equity Securities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 47,539 | 47,839
Fair Value, Recurring Measurements [Member] | Equity Securities [Member] | Level 1 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 41,821 | 41,341
Fair Value, Recurring Measurements [Member] | Equity Securities [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 5,644 | 6,450
Fair Value, Recurring Measurements [Member] | Equity Securities [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available-for-sale securities, fair value | 74 | 48
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 | 2,347,816 | 2,063,899
Fair Value, Recurring Measurements [Member] | Separate Accounts Assets, Fair Value Disclosure [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Separate accounts assets | 2,347,816 | 2,063,899
Fair Value, Recurring Measurements [Member] | Separate Accounts Liabilities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Separate accounts liabilities | 2,347,816 | 2,063,899
Fair Value, Recurring Measurements [Member] | Separate Accounts Liabilities [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Separate accounts liabilities | $ 2,347,816 | $ 2,063,899

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