Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash and cash equivalents	$ 257,591	$ 200,714
Receivables	79,932	85,992
Inventory	84,074	81,711
Ore on leach pads	76,335	67,329
Prepaid expenses and other	11,614	10,942
Current assets	509,546	446,688
NON-CURRENT ASSETS
Property, plant and equipment, net	217,345	195,999
Mining properties, net	552,035	589,219
Ore on leach pads, noncurrent	52,885	44,582
Restricted assets	14,792	11,633
Equity securities	11,250	2,766
Receivables	39,739	24,768
Deferred tax assets	1,370	1,942
Other	12,893	14,892
TOTAL ASSETS	1,411,855	1,332,489
CURRENT LIABILITIES
Accounts payable	49,219	48,732
Accrued liabilities and other	50,169	53,953
Debt	108,809	10,431
Royalty obligations	12,915	24,893
Reclamation	1,790	2,071
Current liabilities	222,902	140,080
NON-CURRENT LIABILITIES
Debt	402,257	479,979
Royalty obligations	7,069	4,864
Reclamation	85,048	83,197
Deferred tax liabilities	131,459	147,132
Other long-term liabilities	66,961	55,761
Non-current liabilities	692,794	770,933
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 162,370,864 at June 30, 2016 and 151,339,136 at December 31, 2015	1,624	1,513
Additional paid-in capital	3,101,493	3,024,461
Accumulated other comprehensive income (loss)	(283)	(3,722)
Accumulated deficit	(2,606,675)	(2,600,776)
Stockholders' equity	496,159	421,476
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,411,855	$ 1,332,489