Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted [Abstract]
Basic shares outstanding (in shares)	100,681,000	100,068,000	100,545,000	99,837,000
Effect of potential common stock [Abstract]
Common stock awards (in shares)	847,000	788,000	868,000	815,000
Senior subordinated convertible notes (in shares)	79,000	150,000	99,000	151,000
Diluted shares outstanding (in shares)	101,607,000	101,006,000	101,512,000	100,803,000
Antidilutive stock options (in shares)	665,720	670,000	665,720	781,000