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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	Jun. 30, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Amortized cost	$ 269,256	$ 352,207
OTTI recognized in other comprehensive income (loss)	(171,331)	(171,546)
Change in fair value since OTTI was recognized	209,369	205,712
Fair value	307,294	386,373
Corporate Securities
Investment Holdings [Line Items]
Amortized cost	28,669	69,580
OTTI recognized in other comprehensive income (loss)	(3,700)	(3,700)
Change in fair value since OTTI was recognized	10,783	6,195
Fair value	35,752	72,075
Residential Mortgage Backed Securities
Investment Holdings [Line Items]
Amortized cost	226,789	245,691
OTTI recognized in other comprehensive income (loss)	(167,631)	(167,846)
Change in fair value since OTTI was recognized	198,330	199,191
Fair value	257,488	277,036
Commercial Mortgage Backed Securities
Investment Holdings [Line Items]
Amortized cost	12,821	35,244
OTTI recognized in other comprehensive income (loss)	0	0
Change in fair value since OTTI was recognized	256	0
Fair value	13,077	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	0	326
Fair value	$ 977	$ 2,018

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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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- 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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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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