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Selling Arrangement (Details) (Selling Agreement, USD $)
1 Months Ended 12 Months Ended
Feb. 28, 2011
Dec. 31, 2013
Dec. 31, 2012
Selling Agreement
     
Selling Arrangement      
Payment for arrangement to sell signs $ 4,000,000    
Term of arrangement 10 years    
Amortization expense   400,000 400,000
2014   400,000  
2015   400,000  
2016   400,000  
2017   400,000  
2018   $ 400,000