Stock-Based Compensation (Schedule Of Share-Based Compensation Restricted Stock Activity) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Arrangements with Employees and Nonemployees [Abstract]
Number of Restricted Shares Nonvested at beginning of period			646,000
Number of Restricted Shares granted	40,000	40,000	45,000	40,000
Number of Restricted Shares vested			(20,000)
Number of Restricted Shares forfeited			0
Number of Restricted Shares Nonvested at end of period	671,000		671,000
Weighted Average Grant Date Fair Value Nonvested at beginning of period			$ 20.29
Weighted Average Grant Date Fair Value Shares granted			$ 22.65
Weighted Average Grant Date Fair Value Shares vested			$ 23.30
Weighted Average Grant Date Fair Value Shares forfeited	$ 0.00		$ 0.00
Weighted Average Grant Date Fair Value Nonvested at end of period	$ 20.36		$ 20.36