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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) (Corporate Debt Securities [Member], Available-for-sale Securities [Member])	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Equity, Level 1 to Level 2 Transfers, Description	625	0
Fair Value, Equity, Level 2 to Level 1 Transfers, Description	5100	0

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- Definition

Description of the transfers of financial instruments classified in shareholders' equity measured on a recurring basis out of level 1 and into level 2 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Description of the transfers of financial instruments classified in shareholders' equity measured on a recurring basis out of level 2 and into level 1 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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