Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating Activities
Net (loss) income	$ (32,021)	$ 36,293
Adjustments to reconcile net loss to net cash provided by operating activities:
Depletion, depreciation and accretion (Note 6)	140,837	111,640
Deferred tax recovery (Note 10)	(2,259)	(37,882)
Stock-based compensation expense (Note 8)	29	9,521
Amortization of debt issuance costs (Note 7)	7,915	6,066
Unrealized foreign exchange loss (gain)	4,801	(5,589)
Loss on bond purchased	90	0
Unrealized derivative instruments gain	(10,491)	0
Cash settlement of asset retirement obligation	(3,045)	(223)
Non-cash lease expenses	3,461	2,794
Lease payments	(3,112)	(2,369)
Net change in assets and liabilities from operating activities (Note 13)	1,702	13,809
Net cash provided by operating activities	107,907	134,060
Investing Activities
Additions to property, plant and equipment (Note 6 and 13)	(153,971)	(114,044)
Net cash used in investing activities	(153,971)	(114,044)
Financing Activities
Proceeds from issuance of Senior Notes, net of issuance costs (Note 7)	0	85,615
Proceeds from long-term debt, net of issuance costs (Note 7)	44,781	0
Repayment of long-term debt (Note 7)	(1,894)	0
Repayment of Senior Notes (Note 7)	(24,828)	(36,364)
Purchase of Senior Notes	(1,712)	0
Re-purchase of shares of Common Stock (Note 8)	(3,466)	(8,667)
Proceeds from exercise of stock options	22	367
Lease payments	(7,849)	(7,078)
Net cash provided by financing activities	5,054	33,873
Foreign exchange loss on cash, cash equivalents and restricted cash and cash equivalents	(766)	(1,513)
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents	(41,776)	52,376
Cash and cash equivalents and restricted cash and cash equivalents, beginning of period (Note 13)	111,337	71,038
Cash and cash equivalents and restricted cash and cash equivalents, end of period (Note 13)	$ 69,561	$ 123,414