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Stock-Based Compensation (Details 2) (401(k) Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
401(k) Plan [Member]
Summary of Company expenses attributable to the 401(k) Plan
Expenses attributable to the 401(k) Plan	$ 1,044,255	$ 960,888	$ 897,843

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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