Stock-Based Compensation And Other Employee Benefit Plans (Summary Of Stock-Based Compensation Expense And Related Tax Benefit) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Stock-Based Compensation And Other Employee Benefit Plans [Abstract]
Stock based compensation expense related to restricted share awards	$ 3,600,000		$ 3,800,000	$ 2,400,000
Stock based compensation expense related to stock options			100,000	700,000
Total stock based compensation expense	3,573,000		3,872,000	3,065,000
Income tax benefit from restricted share awards	3,400,000		1,300,000	1,000,000
Income tax benefit from stock options	2,900,000		(300,000)	500,000
Total income tax benefit from stock based compensation	6,300,000		1,000,000	1,500,000
Excess tax benefit from vested shares	2,100,000	[1]
Excess tax benefit from stock options exercised	5,700,000	[1]
Total excess tax benefit from stock based compensation	$ 7,766,000

[1] Excess tax benefits, which represent cash flows from tax deductions in excess of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company's consolidated statements of cash flows.