Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balances at Dec. 31, 2009	$ 1,998,046	$ 803	$ 2,444,262	$ (447,024)	$ 5
Balances, in shares at Dec. 31, 2009		80,310
Net income	(91,308)			(91,308)
Common Stock issued for payment of principal, interest and financing fees on 6.5% Senior Secured Notes, in shares		1,357
Common Stock issued for payment of principal, interest and financing fees on 6.5% Senior Secured Notes	20,006	13	19,993
Common Stock issued to extinguish 3.25% and 1.25% debt, in shares		7,639
Common Stock issued to extinguish 3.25% and 1.25% debt	113,434	77	113,357
Other comprehensive loss	(5)
Common stock issued/cancelled under long-term incentive plans and director fees and options, net, in shares		10
Common stock issued/cancelled under long-term incentive plans and director fees and options, net	594		594
Other	(5)				(5)
Balances at Dec. 31, 2010	2,040,767	893	2,578,206	(538,332)	0
Balances, in shares at Dec. 31, 2010		89,316
Net income	93,499			93,499
Other comprehensive loss	(4,975)				(4,975)
Common stock issued/cancelled under long-term incentive plans and director fees and options, net, in shares		339
Common stock issued/cancelled under long-term incentive plans and director fees and options, net	7,430	4	7,426
Balances at Dec. 31, 2011	2,136,721	897	2,585,632	(444,833)	(4,975)
Balances, in shares at Dec. 31, 2011		89,655
Net income	48,677			48,677
Other comprehensive loss	(2,746)				(2,746)
Common stock share buy back, in shares		(893)
Common stock share buy back	(19,971)	(9)	(19,962)
Acquisition of Joaquin property, in shares		1,310
Acquisition of Joaquin property	30,000	13	29,987
Common stock issued/cancelled under long-term incentive plans and director fees and options, net, in shares		270
Common stock issued/cancelled under long-term incentive plans and director fees and options, net	5,599	2	5,597
Balances at Dec. 31, 2012	$ 2,198,280	$ 903	$ 2,601,254	$ (396,156)	$ (7,721)
Balances, in shares at Dec. 31, 2012		90,342