Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes [Abstract]
Income tax expense	$ 1,037,000	$ (456,000)
Statutory rate	34.00%	34.00%
Valuation allowance	700,000		700,000
Domestic deferred tax assets ratable reversal pattern period	15 years
Operating loss carryforwards, Expiration period	The carry forward rules allow for up to a 20 year carry forward of net operating losses
Net operating loss carry forward period	20 years
Average period required to utilize future income	27 years 6 months
Gross unrecognized tax benefit	$ 1,400,000		$ 1,400,000
Period decrease in unrecognized tax benefits related to research credits	12 months