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Revolving Credit Facility (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Line of Credit Facility [Line Items]  
Interest calculation under revolving credit facility one month LIBOR plus 2.25%,
Revolving Credit Facility (Textual) [Abstract]  
Line of credit facility expiration date Oct. 01, 2017
Revolving credit facility initial borrowing capacity $ 24,000,000
Letters of credit outstanding amount 23,800,000
LIBOR plus rate 1.75%
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
Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Outstanding borrowings on the revolving credit facility $ 0
Interest calculation under revolving credit facility The rate is calculated based on LIBOR plus 1.75%.
Interest rate under revolving credit facility 0.25%
September 30,2014 [Member]
  
Line of Credit Facility [Line Items]  
Funded debt to EBITDA ratio 1.75
September 30,2015 [Member]
  
Line of Credit Facility [Line Items]  
Funded debt to EBITDA ratio 1.5
Thereafter [Member]
  
Line of Credit Facility [Line Items]  
Funded debt to EBITDA ratio 1.25
Maximum [Member] | September 30,2013 [Member]
  
Line of Credit Facility [Line Items]  
Funded debt to EBITDA ratio 2.25
Minimum [Member]
  
Line of Credit Facility [Line Items]  
Minimum Fixed charge coverage ratio 1.25