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Investments (Changes in Net Unrealized Gains on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Investment Holdings [Line Items]
Fixed maturity securities held for investment carried at amortized cost	$ (1,976)	$ 2,245
Investments carried at fair value, available for sale	281,081	1,115,068
Adjustment for effect on other balance sheet accounts:
Deferred policy acquisition costs and deferred sales inducements	(150,962)	(609,751)
Deferred income tax asset/liability	(45,542)	(176,861)
Total adjustment for effect on other balance sheet accounts	(196,504)	(786,612)
Change in net unrealized gains on investments carried at fair value	84,577	328,456
Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
Investments carried at fair value, available for sale	281,094	1,115,085
Equity Securities [Member]
Investment Holdings [Line Items]
Investments carried at fair value, available for sale	$ (13)	$ (17)

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Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs and Deferred Sales Inducements Due to Net Unrealized Gains and Losses on Available for Sale Fixed Maturity and Equity Securities.

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Change in Net Unrealized Gain or Loss, Fixed Maturity Securities, Held for Investment

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Represents the aggregate of the adjustments for the effect on other balance sheet accounts related to the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

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This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax affects would have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 11
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65896914&loc=d3e39076-109324

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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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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