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Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt	$ 83,536	$ 88,755
Less - Current maturities of long-term debt	(393)	(2,899)
Less - Unamortized deferred loan costs	(6,220)	(6,739)
Total long-term debt	76,923	79,117
Notes and deferred payments to sellers, Tealstone acquisition
Debt Instrument [Line Items]
Notes payable	11,460	13,572
Notes payable for transportation and construction equipment and other
Debt Instrument [Line Items]
Notes payable	474	612
Oaktree facility | Senior secured term loans | Equipment-based facility
Debt Instrument [Line Items]
Oaktree Facility	$ 71,602	$ 74,571

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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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Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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