Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net loss	$ (17,585)	$ (91,581)
Non-cash elements included in net loss:
Depreciation, depletion and amortization	126,911	143,040
Gain on disposition of investments	0	(927)
Unrealized (gain) loss on investments	(9,410)	1,159
Adjustment of inventory to market value	0	1,399
Loss on disposition of properties, plants, equipment, and mineral interests	559	4,666
Provision for reclamation and closure costs	4,638	5,298
Stock compensation	5,229	4,758
Deferred income taxes	(6,390)	(26,616)
Amortization of loan origination fees	3,066	1,919
Loss on derivative contracts	4,483	5,824
Foreign exchange (gain) loss	(2,810)	6,263
Foundation grant	1,970	0
Change in assets and liabilities, net of business acquisitions:
Accounts receivable	(3,741)	(10,215)
Inventories	(13,090)	(6,501)
Other current and non-current assets	6,748	14,913
Accounts payable and accrued liabilities	(1,762)	5,616
Accrued payroll and related benefits	11,317	4,506
Accrued taxes	3,276	(5,733)
Accrued reclamation and closure costs and other non-current liabilities	2,483	5,821
Cash provided by operating activities	115,892	63,609
Investing activities:
Additions to properties, plants, equipment and mineral interests	(54,382)	(97,338)
Proceeds from sale of investments	0	1,760
Proceeds from disposition of properties, plants, equipment and mineral interests	305	86
Purchases of investments	(1,661)	(389)
Net cash used in investing activities	(55,738)	(95,881)
Financing activities:
Acquisition of treasury shares	(2,745)	(2,239)
Dividends paid to common shareholders	(3,951)	(3,655)
Dividends paid to preferred shareholders	(414)	(414)
Credit facility and debt issuance fees	(1,287)	(587)
Borrowings on debt	707,107	245,000
Repayments of debt	(716,500)	(195,000)
Repayments of finance leases	(4,246)	(5,484)
Net cash (used in) provided by financing activities	(22,036)	37,621
Effect of exchange rates on cash	(1,873)	257
Net increase in cash, cash equivalents and restricted cash and cash equivalents	36,245	5,606
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	63,477	28,414
Cash, cash equivalents and restricted cash and cash equivalents at end of period	99,722	34,020
Supplemental disclosure of cash flow information:
Cash payment for interest	33,828	21,696
Significant non-cash investing and financing activities:
Addition of finance lease obligations	5,747	6,506
Recognition of operating lease liabilities and right-of-use assets	0	22,365
Payment of accrued compensation in stock	5,095	8,274
Marketable equity securities received for sale of mineral interest	$ 0	$ 2,257