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Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2013
Income Taxes [Abstract]
Roll-forward of unrecognized tax benefits and associated accrued interest and penalties	Roll-forward of unrecognized tax benefits and associated accrued interest and penalties

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- Definition

Tabular disclosure of the change in unrecognized tax benefits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 55

-Paragraph 217

-URI http://asc.fasb.org/extlink&oid=21917533&loc=d3e36027-109320



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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