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Common Stock And Share-Based Compensation (Stock Unit Grants And Stock Unit Expense) (Details) (Restricted Stock Units [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted, Weighted-Average Grant Date Fair Value	$ 10.33	$ 18.43	$ 19.78
Tax benefit related to stock unit expense	$ 5,910	$ 6,256	$ 5,156

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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