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Commitments and Contingencies (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Lawsuit
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Rental Expenses [Abstract]      
Rental expense $ 11,168,000 $ 9,755,000 $ 8,281,000
Commitments under long-term non-cancelable operating leases [Abstract]      
2016 6,218,000    
2017 4,160,000    
2018 1,697,000    
2019 318,000    
2020 0    
Thereafter 0    
Total 12,393,000    
Estimated expenses and liabilities [Abstract]      
Estimated expenses and liabilities 2,086,000 2,585,000 1,796,000
Medical Accrual [Abstract]      
Accrued medical claims 1,107,000 1,057,000 $ 1,129,000
Minimum annual individual medical claims for stop loss coverage 100,000    
Umbrella insurance coverage 2,000,000    
Minimum aggregate medical claims for umbrella insurance coverage for 2014 $ 4,500,000 4,500,000  
Number of suits alleging oil and gas production | Lawsuit 1    
Total number of lawsuits | Lawsuit 3    
Accrued future legal costs $ 500,000 $ 500,000