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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 1.4	$ 1.3
Stock appreciation rights vesting period, minimum (in years)	5
Stock options vesting period, maximum (in years)	7
Contractual terms of stock options granted, years	10
Stock Awards 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4
Stock Awards 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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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