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Investments - Rollforward of OTTI Recognized in Net Income, Fixed-maturity Securities Still Held (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other than Temporary Impairment, OTTI Recognized in Earnings [Roll Forward]
Cumulative other-than-temporary impairment, net income for securities still held, beginning balance	$ 7,489	$ 7,701	$ 11,856	$ 9,550
Additions for other-than-temporary impaired securities where no OTTI were recognized prior to the beginning of the period	451	336	1,682	403
Additions for other-than-temporary impaired securities where OTTI have been recognized prior to the beginning of the period	17	953	1,584	1,679
Reductions due to sales, maturities, calls, amortization or increases in cash flows expected to be collected over the remaining life of credit impaired securities	(640)	(138)	(6,134)	(1,503)
Reductions for exchanges of securities previously impaired	(112)		(1,783)	(1,277)
Cumulative other-than-temporary impairment, credit losses for securities still held, ending balance	$ 7,205	$ 8,852	$ 7,205	$ 8,852

X

- Definition

Other than temporary impairment credit losses recognized in earnings reductions sales, maturities, calls, amortization or increases in cash flows.

+ References

No definition available.

+ Details

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X

- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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X

- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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X

- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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X

- Definition

This item represents reductions in the amount of cumulative losses recognized in earnings for other than temporary impairments (OTTI) for which a portion of the impairment had been recognized in other comprehensive income (a component of shareholders' equity) due to a change in status of the impaired security because of a change in the entity's intent to either sell the impaired security or it has become more likely than not that the entity will be required to sell the security before recovery of its cost basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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