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Secured Credit Facility and Other Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 94,351	$ 98,950
Less - Current maturities of long-term debt	(826)	(3,978)
Less - Unamortized deferred loan costs	(7,776)	(8,812)
Total long-term debt	85,749	86,160
Notes and deferred payments to sellers, Tealstone acquisition
Debt Instrument [Line Items]
Notes payable	12,967	12,393
Notes payable for transportation and construction equipment and other
Debt Instrument [Line Items]
Notes payable	1,063	1,557
Oaktree facility | Senior secured term loans | Equipment-based facility
Debt Instrument [Line Items]
Loans	$ 80,321	$ 85,000

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Long-term Debt, Current Maturities, Gross

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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