Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 151,883	$ 175,012
Short term investments	1,316	20,254
Receivables	84,782	83,497
Ore on leach pad	29,773	27,252
Metal and other inventory	151,049	132,781
Deferred tax assets	2,090	1,869
Restricted assets	456	60
Prepaid expenses and other	19,943	24,218
Total Current Assets	441,292	464,943
NON-CURRENT ASSETS
Property, plant and equipment, net	693,569	687,676
Mining properties, net	1,975,364	2,001,027
Ore on leach pad, non-current portion	10,613	6,679
Restricted assets	29,247	28,911
Marketable securities	20,268	19,844
Receivables, non-current portion	41,641	40,314
Debt issuance costs, net	1,633	1,889
Deferred tax assets	202	263
Other	12,664	12,895
TOTAL ASSETS	3,226,493	3,264,441
CURRENT LIABILITIES
Accounts payable	64,307	78,590
Accrued liabilities and other	8,875	13,126
Accrued income taxes	13,577	47,803
Accrued payroll and related benefits	13,244	16,240
Accrued interest payable	1,122	559
Current portion of capital leases and other debt obligations	80,857	32,602
Current portion of royalty obligation	64,739	61,721
Current portion of reclamation and mine closure	1,978	1,387
Deferred tax liabilities	284	53
Total Current Liabilities	248,983	252,081
NON-CURRENT LIABILITIES
Long-term debt and capital leases	63,934	115,861
Non-current portion of royalty obligation	176,119	169,788
Reclamation and mine closure	32,488	32,371
Deferred tax liabilities	535,180	527,573
Other long-term liabilities	28,236	30,046
Total Noncurrent Liabilities	835,957	875,639
COMMITMENTS AND CONTINGENCIES (Notes 10, 11, 12,13, 14, 15)
SHAREHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 150,000,000 shares, 89,882,510 issued at March 31, 2012 and 89,655,124 issued December 31, 2011	899	897
Additional paid-in capital	2,586,063	2,585,632
Accumulated deficit	(440,858)	(444,833)
Accumulated other comprehensive loss	(4,551)	(4,975)
Total Shareholders' Equity	2,141,553	2,136,721
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 3,226,493	$ 3,264,441