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Revolving Credit Facility and Long-Term Debt (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 18, 2012
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2012
Term Loan [Member]
Nov. 01, 2012
Term Loan [Member]
Dec. 31, 2012
September 30, 2014 [Member]
Dec. 31, 2012
September 30, 2015 [Member]
Dec. 31, 2012
Thereafter [Member]
Dec. 31, 2012
Maximum [Member]
September 30, 2013 [Member]
Dec. 31, 2012
Minimum [Member]
Revolving Credit Facility (Textual) [Abstract]                    
Revolving credit facility borrowing capacity $ 29,500,000 $ 24,000,000                
Outstanding borrowings on the revolving credit facility     4,500,000              
Interest calculation under revolving credit facility     The rate is calculated based on LIBOR plus 1.75%.              
LIBOR plus rate 1.75%     2.25%            
Interest rate under revolving credit facility     0.25%              
Minimum Fixed charge coverage ratio                   1.25
Funded debt to EBITDA ratio           1.75 1.5 1.25 2.25  
Term loan with principal bank         5,500,000          
Payment of Monthly installments of term loan       18,375            
Term loan from Bank, Interest rate description       one month LIBOR plus 2.25%            
Revolving Credit Facility (Additional Textual) [Abstract]                    
Line of credit facility expiration date Oct. 01, 2017                  
Letters of credit outstanding amount 23,800,000                  
Reduction in maximum borrowing capacity 2,500,000                  
Ratio of restricted and unrestricted cash and marketable securities to workers compensation and safety incentive liabilities 1.0                  
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing $ 200,000                  
Interest calculation under revolving credit facility The Agreement also provides for an unused commitment fee of 0.25% per annum on the average daily unused amount of the revolving credit facility