Long-term Debt - Summary of obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Obligations
Equipment finance leases (Note 12)	$ 1,315	$ 1,869
Costs associated with issuances of debt	(1,465)	(1,951)
Total	142,919	121,459
Current maturities of long-term debt	(23,685)	(2,107)
Long-term debt, net of current maturities	$ 119,234	$ 119,352
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsIncludingCurrent
Senior secured notes \| Senior secured second-priority lien notes (maturing December 15, 2021)
Obligations
Gross debt	$ 120,569	$ 120,569
Revolving credit facility (maturing August 16, 2023)
Obligations
Gross debt	22,500	0
Other debt
Obligations
Gross debt	$ 0	$ 972

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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, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, including portion classified as current.

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