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Stock Based Awards (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of stock-based compensation expense
Stock-based compensation expense	$ 1,918	$ 1,505	$ 4,033	$ 3,624
Employees and directors [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	1,237	854	2,661	2,379
Non-employees [Member]
Summary of stock-based compensation expense
Stock-based compensation expense	$ 681	$ 651	$ 1,372	$ 1,245

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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