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Income Taxes (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deferred income tax assets:    
Self insurance reserves $ 9,439,000 $ 9,772,000
Contract loss reserves 49,000 254,000
Stock-based awards 5,099,000 5,262,000
Other 3,253,000 3,245,000
Total deferred income tax assets 17,840,000 18,533,000
Deferred income tax liabilities:    
Property and equipment-tax over book depreciation (22,572,000) (20,449,000)
Intangible assets-tax over book amortization (4,056,000) (4,185,000)
Total deferred income tax liabilities (26,628,000) (24,634,000)
Net deferred income taxes (8,788,000) (6,101,000)
Balance sheet classification of deferred income taxes    
Current deferred income tax assets 12,742,000 13,253,000
Non-current deferred income tax liabilities (21,530,000) (19,354,000)
Net deferred income taxes (8,788,000) (6,101,000)
Period under examination 2 years  
Estimated reduction in unrecognized tax benefit due to the lapses in the applicable statutes of limitations and pending federal tax settlements $ 300,000