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Secured Credit Facility and Other Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Oaktree Facility	$ 88,755
Notes payable	88,755	$ 98,950
Less - Current maturities of long-term debt	(2,899)	(3,978)
Less - Unamortized deferred loan costs	(6,739)	(8,812)
Long-term debt, net of current maturities	79,117	86,160
Tealstone
Debt Instrument [Line Items]
Notes payable for transportation and construction equipment and other	13,572	12,393
Notes Payable for Transportation and Construction Equipment
Debt Instrument [Line Items]
Notes payable	612	1,557
Senior Secured Term Loans | Equipment-based Facility | Oaktree Facility
Debt Instrument [Line Items]
Oaktree Facility	$ 74,571	$ 85,000

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