Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 239,722	$ 186,107
Investments	5,556	33,758
Accounts receivable:
Trade	9,717	14,805
Taxes	10,382	10,382
Other, net	8,925	7,003
Inventories:
Concentrates, doré, and stockpiled ore	35,169	28,455
Materials and supplies	25,885	26,100
Other current assets	17,006	13,715
Total current assets	352,362	320,325
Non-current investments	7,449	7,561
Non-current restricted cash and investments	1,005	1,032
Properties, plants, equipment and mineral interests, net	2,006,592	2,020,021
Non-current deferred income taxes	1,179	1,509
Other non-current assets and deferred charges	24,007	14,509
Total assets	2,392,594	2,364,957
Current liabilities:
Accounts payable and accrued liabilities	53,835	46,549
Accrued payroll and related benefits	23,661	31,259
Accrued taxes	6,143	5,919
Current portion of capital leases	6,015	5,608
Accrued interest	5,976	5,745
Other current liabilities	1,388	10,371
Current portion of accrued reclamation and closure costs	8,315	6,679
Total current liabilities	105,333	112,130
Capital leases	8,757	6,193
Accrued reclamation and closure costs	78,102	79,366
Long-term debt	533,230	502,229
Non-current deferred tax liability	112,462	121,546
Non-current pension liability	48,973	46,628
Other non-current liabilities	4,438	12,983
Total liabilities	891,295	881,075
Commitments and contingencies (Notes 2, 4, 7, 9, and 11)
SHAREHOLDERS’ 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 2018 — 401,322,377 shares and 2017 — 399,176,425 shares	101,643	100,926
Capital surplus	1,628,440	1,619,816
Accumulated deficit	(176,158)	(195,484)
Accumulated other comprehensive loss	(31,929)	(23,373)
Less treasury stock, at cost; 2018 — 5,226,791 shares and 2017 — 4,529,450 shares issued and held in treasury	(20,736)	(18,042)
Total shareholders’ equity	1,501,299	1,483,882
Total liabilities and shareholders’ equity	$ 2,392,594	$ 2,364,957