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	(22,770)	0	0	(22,770)	0
Other comprehensive loss	6,170	0	0	0	6,170
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		(655)
Stock Repurchased During Period, Value	(12,557)	(7)	(12,550)
Common stock issued/cancelled under long-term incentive plans and director fees and options, net	3,229	4	3,225	0
Common stock issued/cancelled under long-term incentive plans and director fees and options, net, shares		307
Balances at Jun. 30, 2013	$ 2,351,492	$ 1,016	$ 2,770,953	$ (418,926)	$ (1,551)
Balances, Shares at Jun. 30, 2013		101,567