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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

12 Months Ended

Dec. 31, 2022

Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental cash flow information and non-cash investing and financing activities were as follows:

			For the year ended December 31,
(in thousands)			2022						2021						2020
Supplemental cash flow information:
Cash paid for interest			$	2,096					$	1,204					$	3,089
Cash payments related to income taxes, net			$	18,860					$	4,172					$	255
Supplemental non-cash investing and financing activities:
Property, plant and equipment acquired with equipment notes			$	—					$	9,407					$	1,216
Property, plant and equipment purchased but not yet paid			$	34,569					$	14,082					$	4,054
SNR Mineral Rights Acquisition			$	—					$	—					$	324,125
Revenue recognized in exchange for debt principal reduction			$	13,566					$	54,802					$	21,312
Paycheck Protection Loan forgiveness			$	—					$	3,401					$	—
Decrease in estimates of asset retirement costs			$	10,395					$	8,713					$	—
Operating right-of-use assets obtained in exchange for lease liabilities			$	168					$	—					$	2,932
Finance right-of-use assets obtained in exchange for lease liabilities			$	42					$	88					$	724

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Tabular disclosure of supplemental cash flow information for the periods presented.

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