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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 years	Sep. 30, 2010
Allocated stock-based compensation expense	$ 1.2	$ 1.3	$ 3.6	$ 4.7
Contractual term of stock options granted, years			10
Stock Awards 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Minimum			5
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Maximum			7
Stock Awards 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4
Stock Awards 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3

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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