Business Combination (Summary Of Unaudited Pro Forma) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Business Combination [Abstract]
Total revenues as reported	$ 1,198,673,000	$ 874,705,000	$ 3,057,139,000	$ 2,350,874,000
Total revenues pro forma	1,198,700,000	1,176,900,000	3,596,800,000	3,212,600,000
Income before income taxes as reported	13,704,000	54,800,000	88,053,000	124,252,000
Income (loss) before income taxes pro forma	$ 22,300,000	$ 47,500,000	$ 72,600,000	$ (66,900,000)