Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 186,107	$ 169,777
Investments	33,758	29,117
Accounts receivable:
Trade	14,805	20,082
Taxes	10,382	187
Other, net	7,003	9,780
Inventories:
Concentrates, doré, stockpiled ore, and metals in transit and in-process	28,455	25,944
Materials and supplies	26,100	24,079
Other current assets	13,715	12,125
Total current assets	320,325	291,091
Non-current investments	7,561	5,002
Non-current restricted cash and investments	1,032	2,200
Long-lived assets	2,020,021	2,032,685
Deferred income taxes	1,509	35,815
Other non-current assets	14,509	4,884
Total assets	2,364,957	2,371,677
Current liabilities:
Accounts payable and accrued liabilities	46,549	60,064
Accrued payroll and related benefits	31,259	36,515
Accrued taxes	5,919	9,061
Current portion of capital leases	5,608	5,653
Current portion of accrued reclamation and closure costs	6,679	5,653
Current portion of debt		470
Accrued interest	5,745	5,745
Other current liabilities	10,371	3,064
Total current liabilities	112,130	126,225
Long-term capital leases	6,193	5,838
Reclamation and closure costs, long-term	79,366	79,927
Long-term debt	502,229	500,979
Deferred tax liability	121,546	122,855
Non-current pension liability	46,628	44,491
Other non-current liabilities	12,983	11,518
Total liabilities	881,075	891,833
Commitments and contingencies (Notes 2, 3, 4, 6, 7, 8, and 10)
STOCKHOLDERS’ EQUITY
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 and outstanding 2017 — 399,176,425 shares and 2016 — 395,286,875 shares	100,926	99,806
Capital surplus	1,619,816	1,597,212
Accumulated deficit	(195,484)	(167,437)
Accumulated other comprehensive loss, net	(23,373)	(34,602)
Less treasury stock, at cost; 2017 — 4,529,450 and 2016 — 3,941,210 shares issued and held in treasury	(18,042)	(15,174)
Total stockholders’ equity	1,483,882	1,479,844
Total liabilities and stockholders’ equity	$ 2,364,957	$ 2,371,677

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.