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Share-Based Compensation (Information Pertaining To Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Share-Based Compensation
Weighted average grant-date fair value of stock options granted:	$ 1,477,000	$ 2,176,000
Total fair value of stock options vested:	1,015,000	681,000
Total intrinsic value of stock options exercised:	4,736,000	3,738,000
Total pre-tax stock-based compensation expense charged against income:	1,402,000	740,000
Total unrecognized compensation expense related to non-vested options:	$ 4,015,000	$ 3,631,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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