Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 159,643	$ 192,032
Receivables	35,864	19,069
Inventory	61,723	58,230
Ore on leach pads	75,584	73,752
Prepaid expenses and other	18,203	15,053
Disposal Group, Including Discontinued Operation, Assets, Current	0	91,421
Current assets	351,017	449,557
NON-CURRENT ASSETS
Property, plant and equipment, net	266,157	254,737
Mining properties, net	843,821	829,569
Ore on leach pads, noncurrent	67,430	65,393
Restricted assets	22,116	20,847
Equity and debt securities	37,317	34,837
Receivables	55,428	28,750
Other	18,649	17,485
TOTAL ASSETS	1,661,935	1,701,175
CURRENT LIABILITIES
Accounts payable	44,864	48,592
Accrued liabilities and other	105,149	94,930
Debt	17,040	30,753
Reclamation	3,777	3,777
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	50,677
Current liabilities	170,830	228,729
NON-CURRENT LIABILITIES
Debt	396,984	380,569
Reclamation	119,154	117,055
Deferred tax liabilities	105,224	105,148
Other long-term liabilities	55,432	54,697
Non-current liabilities	676,794	657,469
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 186,176,237 issued and outstanding at March 31, 2018 and 185,637,724 at December 31, 2017	1,862	1,856
Additional paid-in capital	3,355,710	3,357,345
Accumulated other comprehensive income (loss)	(363)	2,519
Accumulated deficit	(2,542,898)	(2,546,743)
Stockholders' equity	814,311	814,977
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,661,935	$ 1,701,175