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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stock award plans and stock-based compensation
Stock-based compensation expense (in dollars)	$ 0.8	$ 0.9	$ 1.6	$ 2.0
2000 Stock Plan
Stock award plans and stock-based compensation
Number of shares of common stock available for future grant	0		0

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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