Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 270,861	$ 206,690
Receivables	116,921	81,074
Ore on leach pads	48,204	50,495
Inventory	114,931	132,023
Deferred tax assets	7,364	35,008
Prepaid expenses and other	15,523	25,940
Assets, Current	573,804	531,230
NON-CURRENT ASSETS
Property, plant, and equipment, net	227,911	486,273
Mining properties, net	501,192	1,751,501
Ore on leach pads	37,889	31,528
Restricted assets	7,037	7,014
Equity securities	5,982	14,521
Receivables	21,686	36,574
Debt issuance costs, net	9,851	10,812
Deferred tax assets	60,151	1,189
Other	9,915	15,336
TOTAL ASSETS	1,455,418	2,885,978
CURRENT LIABILITIES
Accounts payable	49,052	53,847
Accrued liabilities and other	51,513	38,266
Debt	17,498	2,505
Royalty obligations	43,678	48,019
Reclamation	3,871	913
Deferred tax liabilities	8,078	1,011
Current liabilities	173,690	144,561
NON-CURRENT LIABILITIES
Debt	460,899	306,130
Royalty obligations	27,651	65,142
Reclamation	66,943	57,515
Deferred tax liabilities	111,006	556,246
Other long-term liabilities	29,911	25,817
Non-current liabilities	696,410	1,010,850
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014 and 102,843,003 at December 31, 2013	1,034	1,028
Additional paid-in capital	2,789,695	2,781,164
Accumulated other comprehensive loss	(2,808)	(4,906)
Accumulated deficit	(2,202,603)	(1,046,719)
Stockholders' equity	585,318	1,730,567
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,455,418	$ 2,885,978