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Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 344,854	$ 375,397
Less - Current maturities of long-term debt	(59,962)	(77,434)
Less - Unamortized debt issuance costs	(5,717)	(6,714)
Long term debt	279,175	291,249
Other Debt
Debt Instrument [Line Items]
Long-term debt	10,354	10,397
Secured Debt | Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	324,500	355,000
Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	0	0
Secured Debt | Credit Facility
Debt Instrument [Line Items]
Long-term debt	324,500	355,000
Notes Payable, Other Payables | Plateau Excavation
Debt Instrument [Line Items]
Long-term debt	$ 10,000	$ 10,000

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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.

+ References

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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