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Secured Credit Facility and Other Debt - Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Loans $ 90,138  
Total loans, Net 90,138 $ 5,394
Long-term Debt 90,138 5,394
Current maturities of long-term debt 3,978 4,648
Less current deferred loan costs 0 (803)
Less current maturities of long-term debt, net 3,978 3,845
Long-term debt, net of current maturities 86,160 1,549
Tealstone    
Debt Instrument [Line Items]    
Notes payable for transportation and construction equipment and other 12,393 0
Notes Payable for Transportation and Construction Equipment    
Debt Instrument [Line Items]    
Notes payable for transportation and construction equipment and other 1,557 2,665
Senior Secured Term Loans | Equipment-based Facility | Nations    
Debt Instrument [Line Items]    
Loans 85,000 3,532
Less deferred loan costs (8,812) (803)
Total loans, Net 76,188 2,729
Long-term Debt $ 76,188 $ 2,729