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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Statements of Stockholders' Equity [Abstract]
Deferred compensation plan held Rabbi Trust	30,840	30,597
Share issued under the performance incentive plan withheld for employee taxes	5,670	12,324
Cash dividends declared per share of common stock	$ 0.345	$ 1.365

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- Definition

Deferred compensation plan held Rabbi Trust

+ References

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- Definition

Share issued under the performance incentive plan withheld for employee taxes

+ References

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 04



-Article 3







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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.3-04)



-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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