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Investments (Schedule of Other Than Temporary Impairment Losses, Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Amortized cost	$ 248,456	$ 352,207
OTTI recognized in other comprehensive income (loss)	(149,146)	(171,546)
Change in fair value since OTTI was recognized	181,705	205,712
Fair value	281,015	386,373
Corporate Securities
Investment Holdings [Line Items]
Amortized cost	50,755	69,580
OTTI recognized in other comprehensive income (loss)	(3,700)	(3,700)
Change in fair value since OTTI was recognized	9,268	6,195
Fair value	56,323	72,075
Residential Mortgage Backed Securities
Investment Holdings [Line Items]
Amortized cost	183,948	245,691
OTTI recognized in other comprehensive income (loss)	(145,446)	(167,846)
Change in fair value since OTTI was recognized	172,577	199,191
Fair value	211,079	277,036
Commercial Mortgage Backed Securities
Investment Holdings [Line Items]
Amortized cost	12,776	35,244
OTTI recognized in other comprehensive income (loss)	0	0
Change in fair value since OTTI was recognized	(401)	0
Fair value	12,375	35,244
Other Asset Backed Securities
Investment Holdings [Line Items]
Amortized cost	977	1,692
OTTI recognized in other comprehensive income (loss)	0	0
Change in fair value since OTTI was recognized	261	326
Fair value	$ 1,238	$ 2,018

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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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- Definition

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

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- Definition

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

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- Definition

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