Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted [Abstract]
Basic shares outstanding (in shares)	101,071,000	100,377,000
Effect of potential common stock [Abstract]
Common stock awards (in shares)	1,172,000	852,000
Senior subordinated convertible notes (in shares)	75,000	132,000
Diluted shares outstanding (in shares)	102,318,000	101,361,000
Antidilutive stock options (in shares)	988,475	697,555