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Stock Based Awards (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of stock-based compensation expense
Stock-based compensation expense	$ 1,870	$ 1,803	$ 5,903	$ 5,427
Employees and directors [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	1,256	995	3,917	3,374
Non-employees [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	$ 614	$ 808	$ 1,986	$ 2,053

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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