Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plans [Abstract]
Company's matching percentage of employees' contribution	40.00%	20.00%	20.00%
Company's matching contribution of employees' salary	5.00%	5.00%	5.00%
Company's total contributions	$ 500,000	$ 204,000	$ 204,000