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Intangible and Other Non-Current Assets Intangible and Other Non-Current Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred Costs and Other Noncurrent Assets [Abstract]        
Tradenames   $ 14,372 $ 11,663  
Other   15 50  
Intangible and other non-current assets   18,117 14,957  
Noncompete Agreements        
Deferred Costs and Other Noncurrent Assets [Abstract]        
Prepaid agreements not-to-compete, net of accumulated amortization of $5,501 and $6,051, respectively   3,730 3,244  
Accumulated amortization   6,051 5,501  
Amortization of intangible assets   $ 550 $ 435 $ 300
Noncompete Agreements | Minimum        
Deferred Costs and Other Noncurrent Assets [Abstract]        
Term of agreements not to compete   1 year    
Noncompete Agreements | Maximum        
Deferred Costs and Other Noncurrent Assets [Abstract]        
Term of agreements not to compete   10 years    
Noncompete Agreements        
Deferred Costs and Other Noncurrent Assets [Abstract]        
Increase (Decrease) in Deferred Charges   $ 900    
Trade Names        
Deferred Costs and Other Noncurrent Assets [Abstract]        
Tradenames acquired   2,700    
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 145 $ 0