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Investments - Schedule of Estimated Fair Values and Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fixed maturity securities
Less than 12 months
Fair Value	$ 1,928,493	$ 86,424
Unrealized Losses	(27,579)	(2,297)
12 months of greater
Fair Value	37,415	59,504
Unrealized Losses	(3,246)	(2,026)
Fair Value	1,965,908	145,928
Unrealized Losses	(30,825)	(4,323)
U.S. Government and government agencies
Less than 12 months
Fair Value	26,378	5,044
Unrealized Losses	(158)	(17)
12 months of greater
Fair Value	0	2,199
Unrealized Losses	0	(14)
Fair Value	26,378	7,243
Unrealized Losses	(158)	(31)
States, municipalities and political subdivisions
Less than 12 months
Fair Value	204,991	32,939
Unrealized Losses	(2,583)	(834)
12 months of greater
Fair Value	7,051	10,757
Unrealized Losses	(259)	(218)
Fair Value	212,042	43,696
Unrealized Losses	(2,842)	(1,052)
Foreign government
Less than 12 months
Fair Value		0
Unrealized Losses		0
12 months of greater
Fair Value		5,999
Unrealized Losses		(333)
Fair Value		5,999
Unrealized Losses		(333)
Residential mortgage-backed securities
Less than 12 months
Fair Value	53,126	5,139
Unrealized Losses	(850)	(546)
12 months of greater
Fair Value	2,260	16,150
Unrealized Losses	(122)	(718)
Fair Value	55,386	21,289
Unrealized Losses	(972)	(1,264)
Commercial mortgage-backed securities
Less than 12 months
Fair Value	40,963	5,053
Unrealized Losses	(509)	(12)
12 months of greater
Fair Value	0	1,003
Unrealized Losses	0	(4)
Fair Value	40,963	6,056
Unrealized Losses	(509)	(16)
Asset-backed securities
Less than 12 months
Fair Value	164,675	19,771
Unrealized Losses	(2,637)	(64)
12 months of greater
Fair Value	2,250	3,963
Unrealized Losses	(139)	(99)
Fair Value	166,925	23,734
Unrealized Losses	(2,776)	(163)
Corporate and other
Less than 12 months
Fair Value	1,438,360	18,478
Unrealized Losses	(20,842)	(824)
12 months of greater
Fair Value	25,854	19,433
Unrealized Losses	(2,726)	(640)
Fair Value	1,464,214	37,911
Unrealized Losses	$ (23,568)	$ (1,464)

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- Definition

Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months [Abstract]

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Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, More than 12 Months [Abstract]

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

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