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Long Term Debt (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Long Term Debt (Textual) [Abstract]      
Interest expense under credit agreement and long-term debt $ 5,600,000 $ 9,300,000 $ 8,900,000
Capitalized interest on long-term debt 200,000 200,000 500,000
Series A Term Note [Member]
      
Annual term note payment 2,100,000    
Quarterly paid interest rate 10.50%    
Series B Term Note [Member]
      
Annual term note payment 1,500,000    
Quarterly paid interest rate 10.22%    
Series C Term Note [Member]
      
Annual term note payment 1,400,000    
Quarterly paid interest rate 9.11%    
Series D Term Note [Member]
      
Annual term note payment $ 643,000    
Quarterly paid interest rate 9.07%