Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 129,830	$ 62,452
Accounts receivable:
Trade	27,864	11,952
Taxes	1,584	20,048
Other, net	9,745	6,421
Inventories:
Concentrates, doré, stockpiled ore, and metals in transit and in-process	57,936	30,364
Materials and supplies	38,608	35,849
Other current assets	19,114	12,038
Total current assets	284,681	179,124
Investments	15,148	6,207
Restricted cash and investments	1,053	1,025
Properties, plants, equipment and mineral interests, net	2,345,219	2,423,698
Operating lease right-of-use assets	10,628	16,381
Deferred income taxes	2,912	3,537
Other non-current assets	8,083	7,336
Total assets	2,667,724	2,637,308
Current liabilities:
Accounts payable and accrued liabilities	68,516	57,716
Accrued payroll and related benefits	31,807	26,916
Accrued taxes	8,349	4,776
Finance leases	6,491	5,429
Operating leases	3,008	5,580
Accrued reclamation and closure costs	5,582	4,581
Accrued interest	14,157	5,804
Current derivative liabilities	11,737	6,170
Other current liabilities	138	2
Total current liabilities	149,785	116,974
Finance leases	9,274	7,214
Operating leases	7,634	10,818
Accrued reclamation and closure costs	110,466	103,793
Long-term debt	507,242	504,729
Deferred tax liability	132,475	138,282
Pension liability	44,144	56,219
Other non-current liabilities	4,364	6,856
Total liabilities	965,384	944,885
Commitments and contingencies (Notes 3, 4, 5, 7, 8, 9, and 11)
Preferred stock, 5,000,000 shares authorized: Series B preferred stock, $0.25 par value, 157,816 shares issued and outstanding, liquidation preference — $7,891	39	39
Common stock, $0.25 par value, authorized 750,000,000 shares; issued 2020 — 538,487,415 shares and 2019 — 529,182,994 shares	134,629	132,292
Capital surplus	2,003,576	1,973,700
Accumulated deficit	(379,519)	(353,331)
Accumulated other comprehensive loss, net	(32,889)	(37,310)
Less treasury stock, at cost; 2020 — 6,821,044 and 2019 — 6,287,271 shares issued and held in treasury	(23,496)	(22,967)
Total stockholders’ equity	1,702,340	1,692,423
Total liabilities and stockholders’ equity	$ 2,667,724	$ 2,637,308