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Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended
Stock-Based Compensation (Details Textual) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Stock-Based Compensation (Textual) [Abstract]
Stock-based compensation expense	$ 830,000	$ 451,000

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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