Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS
Cash and cash equivalents	$ 92,794	$ 55,645
Receivables	23,484	18,666
Inventory	51,210	55,886
Ore on leach pads	74,866	66,192
Prepaid expenses and other	27,254	14,047
Current assets	269,608	210,436
NON-CURRENT ASSETS
Property, plant and equipment, net	230,139	248,789
Mining properties, net	716,790	711,955
Ore on leach pads, noncurrent	81,963	71,539
Restricted assets	9,492	8,752
Equity securities	12,943	35,646
Receivables	26,447	28,709
Other	56,595	62,810
TOTAL ASSETS	1,403,977	1,378,636
CURRENT LIABILITIES
Accounts payable	90,577	69,176
Accrued liabilities and other	119,158	95,616
Debt	22,074	22,746
Reclamation	2,299	3,114
Current liabilities	234,108	190,652
NON-CURRENT LIABILITIES
Debt	253,427	272,751
Reclamation	136,975	133,417
Deferred tax liabilities	34,202	41,976
Other long-term liabilities	51,786	72,836
Non-current liabilities	476,390	$ 520,980
Common Stock, Shares, Outstanding		241,529,021
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,751,283 issued and outstanding at December 31, 2020 and 241,529,021 at December 31, 2019	2,438	$ 2,415
Additional paid-in capital	3,610,297	3,598,472
Accumulated other comprehensive income (loss)	(11,136)	(136)
Accumulated deficit	(2,908,120)	(2,933,747)
Stockholders' equity	693,479	667,004
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,403,977	$ 1,378,636
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	243,751,283	241,529,021