Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Contingency [Line Items]      
Valuation allowance $ 2,827,444 $ 2,869,637  
Interest rate swaps 2,559,448 2,601,154  
Net operating losses 267,996 334,033  
Unrecognized tax benefits 4,900,000 1,400,000 8,100,000
Unrecognized tax benefits that would impact effective tax rate 3,400,000 800,000  
Credits 1,225,197 3,434,973  
Amount of interest and penalties related to uncertain tax positions 300,000    
Federal
     
Income Tax Contingency [Line Items]      
Operating loss carryforwards 27,600,000    
Net operating loss, related to excess stock options 27,600,000    
Credits 1,200,000    
Federal tax credit relating to excess stock options 1,200,000    
State
     
Income Tax Contingency [Line Items]      
Net operating losses 267,996 268,483  
Operating loss carryforwards 5,700,000    
Net operating loss, related to excess stock options $ 5,700,000