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, 2012	$ 2,198,280	$ 903	$ 2,601,254	$ (396,156)	$ (7,721)
Balances, Shares at Dec. 31, 2012		90,342
Net income (loss)	(69,035)	0	0	(69,035)	0
Other comprehensive loss	7,477	0	0	0	7,477
Other Comprehensive Income (Loss), Net of Tax	7,477
Common stock issued for the acquisition of Orko Silver Corp., Shares		11,573
Common stock issued for the acquisition of Orko Silver Corp., Value	173,363	116	173,247	0	0
Warrants issued for the acquisition of Orko Silver Corp., Value	5,777	0	5,777	0	0
Stock Repurchased During Period, Shares		(1,691)
Stock Repurchased During Period, Value	(27,552)	(17)	(27,535)	0	0
Common stock issued/cancelled under long-term incentive plans and director fees and options, net	3,638	4	3,634	0
Common stock issued/cancelled under long-term incentive plans and director fees and options, net, shares		325
Reclassification adjustments for losses included in net income	18,233
Balances at Sep. 30, 2013	$ 2,291,948	$ 1,006	$ 2,756,377	$ (465,191)	$ (244)
Balances, Shares at Sep. 30, 2013		100,549