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Investments (Schedule of Other Than Temporary Impairment Losses, Investments) (Details) - Fixed Maturity Securities [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Amortized cost	$ 399,690	$ 481,421
OTTI recognized in other comprehensive income	(177,494)	(178,824)
Change in fair value since OTTI was recognized	217,747	198,605
Fair value	439,943	501,202
Corporate Securities [Member]
Investment Holdings [Line Items]
Amortized cost	17,549	6,396
OTTI recognized in other comprehensive income	(5,910)	(2,975)
Change in fair value since OTTI was recognized	13,566	9
Fair value	25,205	3,430
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	368,862	466,871
OTTI recognized in other comprehensive income	(169,941)	(170,724)
Change in fair value since OTTI was recognized	205,854	199,149
Fair value	404,775	495,296
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	6,683	8,154
OTTI recognized in other comprehensive income	(1,643)	(5,125)
Change in fair value since OTTI was recognized	(1,566)	(553)
Fair value	$ 3,474	$ 2,476

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- Definition

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

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

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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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