Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS
Cash and cash equivalents	$ 200,714	$ 270,861
Receivables	85,992	107,923
Inventory	81,711	114,931
Ore on leach pads	67,329	48,204
Prepaid expenses and other	10,942	15,523
Current assets	446,688	557,442
NON-CURRENT ASSETS
Property, plant and equipment, net	195,999	227,911
Mining properties, net	589,219	501,192
Ore on leach pads, noncurrent	44,582	37,889
Restricted assets	11,633	7,037
Equity securities	2,766	5,982
Receivables	24,768	21,686
Deferred tax assets	1,942	67,515
Other	14,892	9,915
TOTAL ASSETS	1,332,489	1,436,569
CURRENT LIABILITIES
Accounts payable	48,732	49,052
Accrued liabilities and other	53,953	51,513
Debt	10,431	17,498
Royalty obligations	24,893	43,678
Reclamation	2,071	3,871
Current liabilities	140,080	165,612
NON-CURRENT LIABILITIES
Debt	479,979	451,048
Royalty obligations	4,864	27,651
Reclamation	83,197	66,943
Deferred tax liabilities	147,132	141,076
Other long-term liabilities	55,761	29,911
Non-current liabilities	770,933	716,629
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 151,339,136 at December 31, 2015 and authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014	1,513	1,034
Additional paid-in capital	3,024,461	2,789,695
Accumulated other comprehensive income (loss)	(3,722)	(2,808)
Accumulated deficit	(2,600,776)	(2,233,593)
Stockholders' equity	421,476	554,328
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,332,489	$ 1,436,569