Earnings Per Share (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted
Basic shares outstanding	99,089,000	97,460,000	98,983,000	97,249,000
Effect of potential common stock
Common stock awards	882,000	1,129,000	884,000	1,172,000
Senior subordinated convertible notes	191,000	1,030,000	204,000	1,079,000
Diluted shares outstanding	100,162,000	99,619,000	100,071,000	99,500,000
Antidilutive stock options	579,350	401,600	587,350	408,100