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Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Gross long-term debt	$ 443,035	$ 88,755
Less - Current maturities of long-term debt	(42,473)	(2,899)
Less - Unamortized debt issuance costs	(9,935)	(6,739)
Total long-term debt	390,627	79,117
Secured Debt | Credit Facility
Debt Instrument [Line Items]
Gross long-term debt	420,000	0
Secured Debt | Oaktree Facility
Debt Instrument [Line Items]
Gross long-term debt	0	74,571
Notes Payable | Plateau
Debt Instrument [Line Items]
Gross long-term debt	10,000	0
Notes Payable | Tealstone
Debt Instrument [Line Items]
Gross long-term debt		13,572
Notes Payable | Notes Payable for Transportation and Construction Equipment
Debt Instrument [Line Items]
Gross long-term debt	$ 805	$ 612

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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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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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