Net Income Per Common Share (Schedule Of Earnings Per Share) (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income Per Common Share [Abstract]
Average common shares outstanding during the period for basic computation	176,900	176,483	176,933	175,964
Dilutive effect of employee stock-based compensation	1,008	1,092	939	768
Average common shares outstanding during the period for diluted computation	177,908	177,575	177,872	176,732