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Investments (Schedule of Other Than Temporary Impairment Losses, Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Amortized cost	$ 481,421	$ 569,508
OTTI recognized in other comprehensive income	(178,824)	(173,494)
Change in fair value since OTTI was recognized	198,605	215,636
Fair value	501,202	611,650
Fixed Maturity Securities [Member] | Corporate Securities [Member]
Investment Holdings [Line Items]
Amortized cost	6,396	0
OTTI recognized in other comprehensive income	(2,975)	0
Change in fair value since OTTI was recognized	9	11
Fair value	3,430	11
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	466,871	569,508
OTTI recognized in other comprehensive income	(170,724)	(173,494)
Change in fair value since OTTI was recognized	199,149	215,625
Fair value	495,296	$ 611,639
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]
Investment Holdings [Line Items]
Amortized cost	8,154
OTTI recognized in other comprehensive income	(5,125)
Change in fair value since OTTI was recognized	(553)
Fair value	$ 2,476

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- Definition

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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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