Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 48,677	$ 93,499	$ (91,308)
Add (deduct) non-cash items
Depreciation, depletion and amortization	218,857	224,500	143,813
Accretion of discount on debt and other assets, net	3,431	4,041	3,374
Accretion of royalty obligation	18,294	21,550	19,018
Deferred income taxes	16,163	51,792	(37,628)
Loss on debt extinguishments	1,036	5,526	20,300
Fair value adjustments, net	18,421	46,450	115,458
Gain (loss) on foreign currency transactions	(1,381)	380	3,867
Share-based compensation	8,010	8,122	7,217
(Gain) loss on Disposition of Assets	1,101	(1,145)	(25)
Loss on impairment	5,825	0	0
Other non-cash charges	279	(335)	(167)
Changes in operating assets and liabilities:
Receivables and other current assets	9,756	(21,950)	(6,228)
Prepaid expenses and other	2,489	(8,839)	5,871
Inventories	(48,305)	(30,408)	(47,887)
Accounts payable and accrued liabilities	(31,019)	22,990	29,888
CASH PROVIDED BY OPERATING ACTIVITIES	271,634	416,173	165,563
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of short term investments and marketable securities	(12,959)	(49,501)	(5,872)
Proceeds from sales and maturities of short term investments	21,695	6,246	24,244
Acquisition of Joaquin property	(29,297)	0	0
Capital expenditures	(115,641)	(119,988)	(155,994)
Other	3,087	2,282	5,927
CASH USED IN INVESTING ACTIVITIES	(133,115)	(160,961)	(131,695)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of notes and bank borrowings	0	27,500	176,166
Payments on long-term debt, capital leases, and associated costs	(97,170)	(85,519)	(106,827)
Payments on gold production royalty	(74,734)	(73,191)	(43,125)
Proceeds from gold lease facility	0	0	18,445
Payments on gold lease facility	0	(13,800)	(37,977)
Proceeds from sale-leaseback transactions	0	0	4,853
Additions to restricted assets associated with the Kensington Term Facility	4,645	(1,326)	(2,353)
Payments for Repurchase of Common Stock	(19,971)	0	0
Other	(861)	18	286
CASH USED IN FINANCING ACTIVITIES:	(188,091)	(146,318)	9,468
INCREASE IN CASH AND CASH EQUIVALENTS	(49,572)	108,894	43,336
Cash and cash equivalents at beginning of period	175,012	66,118	22,782
Cash and cash equivalents at end of period	$ 125,440	$ 175,012	$ 66,118