Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 192,032	$ 118,312
Receivables	19,069	53,415
Inventory	58,230	93,436
Ore on leach pads	73,752	64,167
Prepaid expenses and other	15,053	10,015
Disposal Group, Including Discontinued Operation, Assets, Current	91,421	71,442
Current assets	449,557	410,787
NON-CURRENT ASSETS
Property, plant and equipment, net	254,737	193,423
Mining properties, net	829,569	550,290
Ore on leach pads, noncurrent	65,393	67,231
Restricted assets	20,847	17,597
Equity and debt securities	34,837	4,488
Receivables	28,750	13,745
Other	17,485	12,585
Disposal Group, Including Discontinued Operation, Assets, Noncurrent	0	48,763
TOTAL ASSETS	1,701,175	1,318,909
CURRENT LIABILITIES
Accounts payable	48,592	44,660
Accrued liabilities and other	94,930	36,445
Debt	30,753	11,955
Royalty obligations	0	4,995
Reclamation	3,777	3,109
Disposal Group, Including Discontinued Operation, Liabilities, Current	50,677	15,470
Current liabilities	228,729	116,634
NON-CURRENT LIABILITIES
Debt	380,569	198,682
Royalty obligations	0	4,292
Reclamation	117,055	85,592
Deferred tax liabilities	105,148	69,811
Other long-term liabilities	54,697	41,654
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0	33,757
Non-current liabilities	657,469	433,788
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 185,637,724 at December 31, 2017 and 180,933,287 at December 31, 2016	1,856	1,809
Additional paid-in capital	3,357,345	3,314,590
Accumulated other comprehensive income (loss)	2,519	(2,488)
Accumulated deficit	(2,546,743)	(2,545,424)
Stockholders' equity	814,977	768,487
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,701,175	$ 1,318,909