Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities
Net loss	$ (78)	$ (9,700)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depletion, depreciation and accretion (Note 3)	56,150	52,196
Deferred tax expense (Note 7)	13,479	15,277
Stock-based compensation expense (Note 5)	3,361	1,500
Amortization of debt issuance costs (Note 4)	3,306	781
Unrealized foreign exchange (gain) loss	(2,266)	514
Other gain	0	(1,090)
Cash settlement of asset retirement obligation	(183)	0
Non-cash lease expenses	1,413	1,144
Lease payments	(1,058)	(606)
Net change in assets and liabilities from operating activities (Note 10)	(13,297)	(10,763)
Net cash provided by operating activities	60,827	49,253
Investing Activities
Additions to property, plant and equipment	(55,331)	(71,062)
Changes in non-cash investing working capital (Note 10)	16,531	14,871
Net cash used in investing activities	(38,800)	(56,191)
Financing Activities
Proceeds from issuance of Senior Notes, net of issuance costs (Note 4)	85,638	0
Repayment of debt (Note 4)	(36,364)	0
Debt issuance costs (Note 4)	0	(50)
Purchase of Senior Notes	0	(4,225)
Re-purchase of shares of Common Stock (Note 5)	(4,948)	(10,718)
Proceeds from exercise of stock options	161	0
Lease payments	(1,972)	(1,105)
Net cash provided by (used in) financing activities	42,515	(16,098)
Foreign exchange (loss) gain on cash, cash equivalents and restricted cash and cash equivalents	(42)	2,214
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	64,500	(20,822)
Cash and cash equivalents and restricted cash and cash equivalents, beginning of period (Note 10)	71,038	133,358
Cash and cash equivalents and restricted cash and cash equivalents, end of period (Note 10)	$ 135,538	$ 112,536