Earnings Per Share (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted [Abstract]
Basic shares outstanding (in shares)	100,068,000	99,207,000	99,837,000	99,058,000
Effect of potential common stock [Abstract]
Common stock awards (in shares)	788,000	905,000	815,000	894,000
Senior subordinated convertible notes (in shares)	150,000	190,000	151,000	200,000
Diluted shares outstanding (in shares)	101,006,000	100,302,000	100,803,000	100,152,000
Antidilutive stock options (in shares)	670,000	551,850	781,000	601,350