Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net income (loss)	$ 18,971	$ (17,185)
Non-cash elements included in net income (loss):
Depreciation, depletion and amortization	49,546	41,630
Unrealized loss on investments	3,506	978
Gain on exchange of investments	(1,158)	0
Provision for reclamation and closure costs	4,529	1,548
Stock compensation	500	1,219
Deferred taxes	32	(3,252)
Amortization of loan origination fees and loss on extinguishment of debt	539	2,140
Gain on derivative contracts	(10,962)	(10,437)
Foreign exchange loss (gain)	1,755	(8,066)
Other non-cash items, net	8	(104)
Change in assets and liabilities:
Accounts receivable	(2,664)	9,955
Inventories	2,120	(6,602)
Other current and non-current assets	1,528	(2,642)
Accounts payable and accrued liabilities	(24,545)	(11,879)
Accrued payroll and related benefits	(7,995)	9,495
Accrued taxes	2,031	1,332
Accrued reclamation and closure costs and other non-current liabilities	195	(3,203)
Cash provided by operating activities	37,936	4,927
Investing activities:
Additions to properties, plants, equipment and mineral interests	(21,413)	(19,870)
Proceeds from disposition of properties, plants and equipment	19	154
Net cash used in investing activities	21,394	19,716
Financing activities:
Dividends paid to common stockholders	(4,688)	(1,304)
Dividends paid to preferred stockholders	(138)	(138)
Credit facility fees paid	(82)	(458)
Borrowings on debt	0	679,500
Repayments of debt	0	(506,500)
Repayments of finance leases	(1,881)	(1,284)
Net cash (used in) provided by financing activities	(6,789)	169,816
Effect of exchange rates on cash	167	(1,736)
Net increase in cash, cash equivalents and restricted cash and cash equivalents	9,920	153,291
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	130,883	63,477
Cash, cash equivalents and restricted cash and cash equivalents at end of period	140,803	216,768
Supplemental disclosure of cash flow information:
Cash paid for interest	18,406	13,984
Significant non-cash investing and financing activities:
Addition of finance lease obligations and right-of-use assets	3,120	0
Accounts receivable for proceeds on exchange of investments	$ 1,832	$ 0