Earnings Per Share (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted
Basic shares outstanding	97,460,000	95,911,000	97,249,000	95,644,000
Effect of potential common stock
Common stock awards	1,129,000	1,282,000	1,172,000	1,293,000
Senior subordinated convertible notes	1,030,000	1,219,000	1,079,000	1,345,000
Diluted shares outstanding	99,619,000	98,412,000	99,500,000	98,282,000
Antidilutive stock options	401,600	662,000	408,100	662,000