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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, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Amortized cost	$ 363,261	$ 399,690
OTTI recognized in other comprehensive income	(175,705)	(177,494)
Change in fair value since OTTI was recognized	207,282	217,747
Fair value	394,838	439,943
Corporate Securities [Member]
Investment Holdings [Line Items]
Amortized cost	10,496	17,549
OTTI recognized in other comprehensive income	(4,263)	(5,910)
Change in fair value since OTTI was recognized	10,356	13,566
Fair value	16,589	25,205
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	347,911	368,862
OTTI recognized in other comprehensive income	(169,799)	(169,941)
Change in fair value since OTTI was recognized	198,785	205,854
Fair value	376,897	404,775
Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost		6,596
OTTI recognized in other comprehensive income		0
Change in fair value since OTTI was recognized		(107)
Fair value		6,489
Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	4,854	6,683
OTTI recognized in other comprehensive income	(1,643)	(1,643)
Change in fair value since OTTI was recognized	(1,859)	(1,566)
Fair value	$ 1,352	$ 3,474

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- Definition

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

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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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