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Debt - Summary of total debt - (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Long-term Debt Outstanding Balance $ 89,792 $ 78,960
Less: Current Portion of long-term debt (3,681) 0
Long-term debt 86,111 78,960
Notes Payable to Banks [Member]    
Long-term Debt Outstanding Balance $ 31,486 0
Revolving Credit Facility [Member]    
Term (years) 5 years  
Long-term Debt Outstanding Balance $ 58,306 78,960
Equipment Note One [Member] | Notes Payable to Banks [Member]    
Stated Interest Rate (per annum) 4.16%  
Term (years) 5 years  
Long-term Debt Outstanding Balance $ 12,655 0
Equipment Note Two [Member] | Notes Payable to Banks [Member]    
Stated Interest Rate (per annum) 4.23%  
Term (years) 7 years  
Long-term Debt Outstanding Balance $ 12,279 0
Equipment Note Three [Member] | Notes Payable to Banks [Member]    
Stated Interest Rate (per annum) 3.97%  
Term (years) 5 years  
Long-term Debt Outstanding Balance $ 2,291 0
Equipment Note Four [Member] | Notes Payable to Banks [Member]    
Stated Interest Rate (per annum) 4.02%  
Term (years) 7 years  
Long-term Debt Outstanding Balance $ 2,313 0
Equipment Note Five [Member] | Notes Payable to Banks [Member]    
Stated Interest Rate (per annum) 4.01%  
Term (years) 7 years  
Long-term Debt Outstanding Balance $ 1,948 $ 0