Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 269,898	$ (40,972)
Adjustments to reconcile net income to cash and restricted cash provided by operating activities:
Depreciation, depletion and amortization	38,009	53,081
Amortization of right of use asset - operating leases	3,401	2,246
Amortization of deferred financing costs	484	1,379
Non-cash interest expense	7,689	6,647
Amortization of contract obligations	(8,670)	(8,509)
Loss on disposal of property, plant and equipment	228	101
Equity-based compensation expense	84	(555)
Deferred income taxes	19,027	(18,437)
Reclamation of asset retirement obligations	(1,156)	(557)
Increase (decrease) in provision for discounting and credit losses	428	(3,778)
Changes in operating assets and liabilities:
Accounts receivable - including related party receivables	(226,983)	59,690
Inventories	(10,574)	(4,701)
Other current assets	3,160	2,255
Accounts payable	(34,488)	(19,849)
Accrued expenses and other current liabilities	54,967	(26,790)
Operating lease liabilities	(2,086)	(2,758)
Change in other liabilities	58,431	6,746
Net cash provided by operating activities	171,849	5,239
Cash flows from investing activities:
Capital expenditures	(37,768)	(28,604)
Purchase of restricted deposits	(3,548)	(4,550)
Redemption of restricted deposits	140	250
Net cash used in investing activities	(41,176)	(32,904)
Cash flows from financing activities:
Proceeds from interest bearing liabilities and other financial liabilities	0	53,489
Debt issuance costs and other financing costs	0	(1,266)
Principal payments on interest bearing liabilities and other financial liabilities	(4,773)	(38,110)
Principal payments on finance lease obligations	(21)	0
Premiums paid on early redemption of debt	(22)	0
Net cash (used in) provided by financing activities	(4,816)	14,113
Net increase (decrease) in cash and restricted cash	125,857	(13,552)
Effect of exchange rate changes on cash and restricted cash	7,679	1,516
Cash and restricted cash at beginning of period	437,931	45,736
Cash and restricted cash at end of period	571,467	33,700
Supplemental disclosure of cash flow information:
Cash payments for interest	677	7,111
Restricted cash	$ 251	$ 251