Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 212,569	$ 186,107
Short-term investments	34,358	33,758
Accounts receivable:
Trade	19,713	14,805
Taxes	10,382	10,382
Other, net	8,911	7,003
Inventories:
Concentrates, doré, and stockpiled ore	37,024	28,455
Materials and supplies	25,779	26,100
Other current assets	17,369	13,715
Total current assets	366,105	320,325
Non-current investments	7,652	7,561
Non-current restricted cash and cash equivalents	1,005	1,032
Properties, plants, equipment and mineral interests, net	2,008,704	2,020,021
Non-current deferred income taxes	671	1,509
Other non-current assets	13,954	14,509
Total assets	2,398,091	2,364,957
Current liabilities:
Accounts payable and accrued liabilities	51,636	46,549
Accrued payroll and related benefits	21,420	31,259
Accrued taxes	7,273	5,919
Current portion of capital leases	5,669	5,608
Current portion of accrued reclamation and closure costs	8,315	6,679
Accrued interest	14,555	5,745
Other current liabilities	7,066	10,371
Total current liabilities	115,934	112,130
Capital leases	7,094	6,193
Accrued reclamation and closure costs	78,887	79,366
Long-term debt	533,566	502,229
Non-current deferred tax liability	116,866	121,546
Non-current pension liability	48,459	46,628
Other non-current liabilities	2,784	12,983
Total liabilities	903,590	881,075
Commitments and contingencies (Notes 2, 4, 7, 9, and 11)
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, 750,000,000 shares authorized; issued and outstanding March 31, 2018 — 400,301,617 shares and December 31, 2017 — 399,176,425 shares	101,290	100,926
Capital surplus	1,626,298	1,619,816
Accumulated deficit	(187,092)	(195,484)
Accumulated other comprehensive loss	(26,767)	(23,373)
Less treasury stock, at cost; March 31, 2018 - 4,864,799 and December 31, 2017 - 4,529,450 shares issued and held in treasury	(19,267)	(18,042)
Total stockholders’ equity	1,494,501	1,483,882
Total liabilities and stockholders’ equity	$ 2,398,091	$ 2,364,957