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Investments (Cumulative Noncredit Portion of Other Than Temporary Impairment Recognized in Other Comprehensive Income and Change in Fair Value Since Other Than Temporary Impairment) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Amortized cost	$ 289,441	$ 315,164
OTTI recognized in other comprehensive income	(171,760)	(173,974)
Change in fair value since OTTI was recognized	213,644	210,484
Fair value	331,325	351,674
Corporate Securities [Member]
Investment Holdings [Line Items]
Amortized cost	18,064	13,015
OTTI recognized in other comprehensive income	(3,700)	(4,263)
Change in fair value since OTTI was recognized	9,565	10,739
Fair value	23,929	19,491
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	268,848	297,582
OTTI recognized in other comprehensive income	(168,060)	(168,355)
Change in fair value since OTTI was recognized	204,914	201,620
Fair value	305,702	330,847
Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	2,529	4,567
OTTI recognized in other comprehensive income	0	(1,356)
Change in fair value since OTTI was recognized	(835)	(1,875)
Fair value	$ 1,694	$ 1,336

X

- Definition

Change in Fair Value of Securities with Noncredit Other Than Temporary impairment Losses

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No definition available.

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- Definition

Represents the fair value of securities with noncredit other than temporary impairment losses as of the reporting date.

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No definition available.

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- Definition

The cummulative amount of other than temporary impairment (OTTI) loss on a debt security, categorized as either Available-for-sale or Held-to-maturity, related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis that has been recognized since this accounting standard became effective. This amount which is attributable to the parent, is a portion of the deduction from the total impairment losses of Investments (before taxes) presented on the income statement.

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No definition available.

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- Definition

Amortized cost of securities with noncredit OTTI losses recognized during the reporting period.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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