Net Income Per Common Share (Schedule Of Earnings Per Share) (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Income Per Common Share [Abstract]
Average common shares outstanding during the period for basic computation	176,483	174,596	175,964	173,981
Dilutive effect of employee stock-based compensation	1,092	1,012	768	707
Average common shares outstanding during the period for diluted computation	177,575	175,608	176,732	174,688