Stock-Based Compensation And Employee Benefit Plans (Schedule Of Share-Based Compensation Restricted Stock Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Arrangements with Employees and Nonemployees [Abstract]
Number of Restricted Shares Nonvested at beginning of period	646,000
Number of Restricted Shares granted	268,000	205,500	181,750
Number of Restricted Shares vested	(99,000)
Number of Restricted Shares forfeited	0
Number of Restricted Shares Nonvested at end of period	815,000	646,000
Weighted Average Grant Date Fair Value Nonvested at beginning of period	$ 20.29
Weighted Average Grant Date Fair Value Shares granted	$ 21.53
Weighted Average Grant Date Fair Value Shares vested	$ 20.34
Weighted Average Grant Date Fair Value Shares forfeited	$ 0.00
Weighted Average Grant Date Fair Value Nonvested at end of period	$ 20.69	$ 20.29