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Secured Credit Facility and Other Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 88,695	$ 98,950
Less - Current maturities of long-term debt	(3,014)	(3,978)
Less - Unamortized deferred loan costs	(7,257)	(8,812)
Total long-term debt	78,424	86,160
Notes and deferred payments to sellers, Tealstone acquisition
Debt Instrument [Line Items]
Notes payable	13,265	12,393
Notes payable for transportation and construction equipment and other
Debt Instrument [Line Items]
Notes payable	859	1,557
Oaktree facility | Senior secured term loans | Equipment-based facility
Debt Instrument [Line Items]
Loan	$ 74,571	$ 85,000

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