Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss	$ (31,213)	$ (72,065)
Non-cash elements included in net loss:
Depreciation, depletion and amortization	84,185	90,821
Adjustment of inventory to market value	0	1,399
Unrealized (gain) loss on investments	(5,431)	1,033
Loss on disposition of properties, plants, equipment, and mineral interests	573	4,642
Provision for reclamation and closure costs	3,093	3,209
Stock compensation	2,428	3,552
Deferred income taxes	(5,165)	(22,585)
Amortization of loan origination fees and loss on extinguishment of debt	2,624	1,252
Loss (gain) on derivative contracts	11,188	(6,101)
Foreign exchange (gain) loss	(3,725)	12,220
Foundation grant	1,970	0
Change in assets and liabilities:
Accounts receivable	(6,050)	(12,772)
Inventories	(4,580)	(147)
Other current and non-current assets	(924)	16,784
Accounts payable and accrued liabilities	(15,415)	(12,085)
Accrued payroll and related benefits	5,418	1,660
Accrued taxes	3,912	(6,452)
Accrued reclamation and closure costs and other non-current liabilities	(435)	4,348
Cash provided by operating activities	42,453	8,713
Investing activities:
Additions to properties, plants, equipment and mineral interests	(30,689)	(71,245)
Proceeds from disposition of properties, plants and equipment	200	25
Purchases of investments	(637)	(107)
Net cash used in investing activities	(31,126)	(71,327)
Financing activities:
Acquisition of treasury shares	(2,745)	(1,644)
Dividends paid to common stockholders	(2,622)	(2,430)
Dividends paid to preferred stockholders	(276)	(276)
Credit facility fees paid	(551)	(46)
Borrowings on debt	679,500	170,000
Repayments of debt	(666,500)	(118,000)
Repayments of finance leases	(2,840)	(3,377)
Net cash provided by financing activities	3,966	44,227
Effect of exchange rates on cash	(1,794)	432
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	13,499	(17,955)
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	76,976	10,459
Supplemental disclosure of cash flow information:
Cash paid for interest	15,837	19,975
Significant non-cash investing and financing activities:
Addition of finance lease obligations and right-of-use assets	3,100	3,498
Recognition of operating lease liabilities and right-of-use assets	0	22,365
Payment of accrued compensation in stock	$ 5,095	$ 8,274