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Long-Term Debt (Details Textual) (USD $)
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Must not exceed [Member]
Jun. 30, 2012
Must not be less than [Member]
Jun. 30, 2012
LIBOR plus [Member]
Jun. 30, 2012
Revolving credit loan [Member]
Jun. 30, 2012
Revolving credit loan [Member]
Letters of credit [Member]
Jun. 30, 2012
Term loan [Member]
Dec. 31, 2011
Term loan [Member]
Jun. 30, 2012
Revolving credit loan and term loan [Member]
Long-Term Debt (Textual) [Abstract]                    
Revolving credit loan maximum commitment           $ 65,000,000        
Term loan 120,168,311 126,733,619           65,341,595 71,906,903  
Remaining commitments under the revolving credit loan facility           10,200,000        
Sub-limit for letters of credit             5,000,000      
Base interest rate for revolving credit loan and term loan facility         1.00%          
Revolving credit loan and term loan carried interest 3.8021% 3.8125%                
Revolving credit facility and term loan maturity date                   Jul. 30, 2015
Total Debt Ratio     4.75              
Interest Coverage Ratio       2.0            
Fixed Charge Coverage Ratio       1.1            
Maximum amount of undiscounted payments on default $ 120,200,000