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Income Taxes (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Deferred income tax assets:    
Self insurance reserves $ 8,643,000 $ 9,439,000
Contract loss reserves 435,000 49,000
Stock-based awards 4,245,000 5,099,000
Bonus 2,884,000 1,931,000
Other 2,588,000 1,322,000
Total deferred income tax assets 18,795,000 17,840,000
Deferred income tax liabilities:    
Property and equipment-tax over book depreciation (24,037,000) (22,572,000)
Intangible assets-tax over book amortization (3,927,000) (4,056,000)
Total deferred income tax liabilities (27,964,000) (26,628,000)
Net deferred income taxes (9,169,000) (8,788,000)
Balance sheet classification of deferred income taxes    
Current deferred income tax assets 14,550,000 12,742,000
Non-current deferred income tax liabilities (23,719,000) (21,530,000)
Net deferred income taxes (9,169,000) (8,788,000)
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