Basis Of Presentation And Significant Accounting Policies (Schedule Of Stock-Based Compensation Recognized As Expense) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Basis Of Presentation And Significant Accounting Policies [Abstract]
Stock option (income) expense	$ 50,000	[1]	$ (468,000)	[1]	$ 850,000	[1]
Restricted stock expense	8,402,000	[2]	5,627,000	[2]	7,862,000	[2]
Total charged against income before tax benefit	8,452,000		5,159,000		8,712,000
Amount of related income tax benefit recognized in income	3,254,000		2,060,000		3,459,000
Adjustment to stock option expense for actual forfeitures			600,000
Increase (decrease) to restricted stock expense related to accrued cash liability awards	$ 800,000		$ 1,500,000

[1] Includes an adjustment made in 2010 for actual forfeitures resulting in a credit of approximately $0.6 million.

[2] Includes an expense of $0.8 million and $1.5 million related to cash liability awards at December 31, 2011 and 2010, respectively.