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Common Stock and Stock Option Plans (Textual) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Common Stock and Stock Option Plans (Textual) [Abstract]
Grants of stock-based awards
Stock-based compensation expense, including amounts payable under liability awards, for non-employee directors and employees	$ 0.6	$ 0.7	$ 2.0	$ 2.4
Number of options to purchase common stock exercised	2,000		61,000	67,000

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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- Definition

Number of share options (or share units) exercised during the current period.

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