Business Combination (Summary Of Unaudited Pro Forma) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Business Combination
Total revenues as reported	$ 985,087,000	$ 764,295,000	$ 1,858,025,000	$ 1,476,169,000
Total revenues pro forma	1,233,900,000	1,044,000,000	2,397,700,000	2,035,800,000
Income before income taxes as reported	11,583,000	71,997,000	79,987,000	69,452,000
Income (loss) before income taxes pro forma	$ 62,000,000	$ (67,800,000)	$ 74,900,000	$ (86,200,000)