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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
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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