Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net (loss) income	$ (72,065)	$ 20,314
Non-cash elements included in net (loss) income:
Depreciation, depletion and amortization	90,821	62,852
Adjustment of inventory to market value	1,399	0
Loss on investments	1,033	254
Loss (gain) on disposition or impairment of properties, plants, equipment, and mineral interests	4,642	(166)
Provision for reclamation and closure costs	3,209	2,640
Stock compensation	3,552	2,441
Deferred income taxes	(22,585)	(2,977)
Amortization of loan origination fees	1,252	898
Loss (gain) on derivative contracts	(6,101)	(30,236)
Foreign exchange loss (gain)	12,217	(5,348)
Other non-cash items, net	3	(35)
Change in assets and liabilities:
Accounts receivable	(12,772)	2,471
Inventories	(147)	(6,865)
Other current and non-current assets	16,784	(2,507)
Accounts payable and accrued liabilities	(12,085)	8,701
Accrued payroll and related benefits	1,660	(337)
Accrued taxes	(6,452)	(672)
Accrued reclamation and closure costs and other non-current liabilities	4,348	(4,410)
Cash provided by operating activities	8,713	47,018
Investing activities:
Additions to properties, plants, equipment and mineral interests	(71,245)	(43,304)
Proceeds from disposition of properties, plants and equipment	25	463
Purchases of investments	(107)	(31,682)
Maturities of investments	0	59,336
Net cash used in investing activities	(71,327)	(15,187)
Financing activities:
Acquisition of treasury shares	(1,644)	(2,694)
Dividends paid to common shareholders	(2,430)	(2,000)
Dividends paid to preferred shareholders	(276)	(276)
Credit availability and debt issuance fees paid	(46)	(3)
Borrowings on debt	170,000	31,024
Repayments of debt	(118,000)	0
Repayments of finance leases	(3,377)	(3,762)
Net cash provided by financing activities	44,227	22,289
Effect of exchange rates on cash	432	(532)
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents	(17,955)	53,588
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	28,414	187,139
Cash, cash equivalents and restricted cash and cash equivalents at end of period	10,459	240,727
Significant non-cash investing and financing activities:
Addition of finance lease obligations	3,498	7,008
Recognition of operating lease liabilities and right-of-use assets	22,365	0
Payment of accrued compensation in stock	$ 8,274	$ 4,863