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Investments (Other Than Temporary Impairment by Asset Type) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) Securities	Dec. 31, 2015 USD ($) Securities	Dec. 31, 2014 USD ($) Securities
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									22	14
Total OTTI losses									$ (21,349)	$ (25,547)	$ 0
Portion of OTTI losses recognized in (from) other comprehensive income									(1,330)	6,011	(2,627)
Net OTTI losses recognized in operations	$ (9,560)	$ (2,979)	$ (4,446)	$ (5,694)	$ (13,347)	$ (5,229)	$ (828)	$ (132)	$ (22,679)	$ (19,536)	$ (2,627)
Corporate Securities [Member] | Energy [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									2
Total OTTI losses									$ (642)
Portion of OTTI losses recognized in (from) other comprehensive income									0
Net OTTI losses recognized in operations									$ (642)
Corporate Securities [Member] | Materials [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									1
Total OTTI losses									$ (4,554)
Portion of OTTI losses recognized in (from) other comprehensive income									1,575
Net OTTI losses recognized in operations									$ (2,979)
Corporate Securities [Member] | Telecommunications [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									1
Total OTTI losses									$ (4,462)
Portion of OTTI losses recognized in (from) other comprehensive income									562
Net OTTI losses recognized in operations									$ (3,900)
Corporate Securities [Member] | Utilities [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									2
Total OTTI losses									$ (6,961)
Portion of OTTI losses recognized in (from) other comprehensive income									798
Net OTTI losses recognized in operations									$ (6,163)
Corporate Securities [Member] | Industrial [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities										2
Total OTTI losses										$ (15,414)
Portion of OTTI losses recognized in (from) other comprehensive income										2,975
Net OTTI losses recognized in operations										$ (12,439)
Residential Mortgage Backed Securities [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									9	11	7
Total OTTI losses									$ 0	$ (133)	$ 0
Portion of OTTI losses recognized in (from) other comprehensive income									(783)	(2,089)	(2,627)
Net OTTI losses recognized in operations									$ (783)	$ (2,222)	$ (2,627)
Commercial Mortgage Backed Securities [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									5
Total OTTI losses									$ (1,540)
Portion of OTTI losses recognized in (from) other comprehensive income									0
Net OTTI losses recognized in operations									$ (1,540)
Other Asset Backed Securities [Member]
Gain (Loss) on Investments [Line Items]
Other than temporary impairment, number of securities | Securities									2	1
Total OTTI losses									$ (3,190)	$ (10,000)
Portion of OTTI losses recognized in (from) other comprehensive income									(3,482)	5,125
Net OTTI losses recognized in operations									$ (6,672)	$ (4,875)

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Item represents the number of securites for which other than temporary impairment was recognized.

+ References

No definition available.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

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Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25362-111560

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 34D
-URI http://asc.fasb.org/extlink&oid=27723805&loc=SL6284304-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

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+ References

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

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