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Investments - Schedule of Major Industry Types of Fixed Maturity Holdings (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,985,637
Fair Value	2,985,443	$ 1,340,626
Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,096,940	589,803
Fair Value	$ 2,093,649	$ 640,230
Percentage of Total	100.00%	100.00%
Corporate And Other Fixed Maturities | Finance, insurance, and real estate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 385,333	$ 191,234
Fair Value	$ 384,306	$ 203,735
Percentage of Total	18.40%	31.80%
Corporate And Other Fixed Maturities | Transportation, communications, electric, gas and sanitary services
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 626,457	$ 186,114
Fair Value	$ 631,183	$ 201,802
Percentage of Total	30.10%	31.50%
Corporate And Other Fixed Maturities | Manufacturing
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 715,322	$ 100,942
Fair Value	$ 708,375	$ 111,391
Percentage of Total	33.80%	17.40%
Corporate And Other Fixed Maturities | Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 369,828	$ 111,513
Fair Value	$ 369,785	$ 123,302
Percentage of Total	17.70%	19.30%

X

- Definition

Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, Before Tax, Percentage of Total

+ References

No definition available.

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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