Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2011

Net Income Per Common Share [Abstract]

Computation of Basic and Diluted Net Income per Common Share

	Six MonthsEnded		ThreeMonths Ended
	June 30,		June 30,
	2011	2010	2011	2010
Average common shares outstanding during
the period for basic computation	137,971	136,647	138,114	136,785
Dilutiveeffect of employeestock-based compensation	547	313	667	227
Average common shares outstanding during
the period for diluted computation	138,518	136,960	138,781	137,012