Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net (loss) income	$ (9,370)	$ 24,199
Non-cash elements included in net (loss) income:
Depreciation, depletion and amortization	73,656	92,861
Write-down of inventory	754	6,431
Fair value adjustments, net	(14,185)	5,214
Provision for reclamation and closure costs	3,271	6,183
Stock compensation	2,525	3,302
Deferred income taxes	(1,290)	(7,745)
Foreign exchange loss	(3,442)	4,455
Other non-cash items, net	982	1,071
Change in assets and liabilities:
Accounts receivable	19,199	(9,432)
Inventories	(8,352)	5,719
Other current and non-current assets	(894)	4,125
Accounts payable and accrued liabilities	17,119	(6,489)
Accrued payroll and related benefits	278	(5,351)
Accrued taxes	(5,683)	(999)
Accrued reclamation and closure costs and other non-current liabilities	3,524	696
Cash provided by operating activities	78,092	124,240
Investing activities:
Additions to properties, plants, equipment and mineral interests	(55,807)	(53,311)
Proceeds from disposition of properties, plants and equipment	730	131
Purchases of investments	(21,899)	0
Proceeds from sale of investments	2,487	0
Net cash used in investing activities	74,489	53,180
Financing activities:
Acquisition of treasury shares	(3,677)	(4,525)
Dividends paid to common and preferred stockholders	(7,027)	(10,991)
Credit facility fees paid	(74)	(82)
Repayments of finance leases	(3,333)	(3,770)
Net cash used in financing activities	(14,111)	(19,368)
Effect of exchange rates on cash	(1,321)	(28)
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents	(11,829)	51,664
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	211,063	130,883
Cash, cash equivalents and restricted cash and cash equivalents at end of period	199,234	182,547
Supplemental disclosure of cash flow information:
Cash paid for interest	18,749	18,499
Cash paid for income and mining taxes	11,888	9,469
Significant non-cash investing and financing activities:
Addition of finance lease obligations and right-of-use assets	5,051	3,120
Accounts receivable for proceeds on exchange of investments	$ 0	$ 1,832