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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	Mar. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Amortized cost	$ 460,085	$ 481,421
OTTI recognized in other comprehensive income	(179,148)	(178,824)
Change in fair value since OTTI was recognized	196,759	198,605
Fair value	477,696	501,202
Fixed Maturity Securities [Member] | Corporate Securities [Member]
Investment Holdings [Line Items]
Amortized cost	8,592	6,396
OTTI recognized in other comprehensive income	(3,537)	(2,975)
Change in fair value since OTTI was recognized	2,080	9
Fair value	7,135	3,430
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	443,158	466,871
OTTI recognized in other comprehensive income	(170,486)	(170,724)
Change in fair value since OTTI was recognized	196,000	199,149
Fair value	468,672	495,296
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	8,335	8,154
OTTI recognized in other comprehensive income	(5,125)	(5,125)
Change in fair value since OTTI was recognized	(1,321)	(553)
Fair value	$ 1,889	$ 2,476

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- 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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