Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted [Abstract]
Basic shares outstanding (in shares)	100,573,000	99,881,000	100,475,000	99,720,000
Effect of potential common stock [Abstract]
Common stock awards (in shares)	909,000	792,000	884,000	826,000
Senior subordinated convertible notes (in shares)	87,000	150,000	109,000	150,000
Diluted shares outstanding (in shares)	101,569,000	100,823,000	101,468,000	100,696,000
Antidilutive stock options (in shares)	457,305	749,666	651,805	770,665