Net Income Per Common Share (Tables)

9 Months Ended

Sep. 30, 2011

Net Income Per Common Share [Abstract]

Schedule Of Earnings Per Share

	Nine Months Ended		Three Months Ended
	September 30,		September 30,
	2011	2010	2011	2010
Average common shares outstanding during	138,081	136,798	138,297	137,095
the period for basic computation
Dilutive effect of employee stock-based compensation	544	314	654	299
Average common shares outstanding during
the period for diluted computation	138,625	137,112	138,951	137,394