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Consolidated Statements Of Cash Flows (Parenthetical)	12 Months Ended
Consolidated Statements Of Cash Flows (Parenthetical)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplementary Cash Flow Information:
Shares issued pursuant to acquisition, shares			99,000
Common Stock issued pursuant to Employee Stock Plans, shares	76,000	73,000	73,000

Number of shares of stock issued during the period pursuant to acquisitions.

Number of shares issued during the period as a result of an employee stock purchase plan.