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Equity-Based Compensation (Fair Value Of Performance Share Awards) (Details) (Performance Shares [Member], USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Performance Shares [Member]
Shares granted	77,767	81,162
Stock price as of valuation date	$ 39.10	$ 31.88
Risk-free rate	1.26%	1.29%
Fair value of a performance share	$ 55.84	$ 45.30

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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