Metal and Other Inventory (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventories
Concentrate and dore inventory	$ 12,788	$ 14,855
Other Inventory, Net of Reserves	54,622	52,250
Supplies	66,168	64,918
Metal and other inventory	133,578	132,023
Ore on Leach Pad, Current	59,895	50,495
Ore on Leach Pad Non Current	34,485	31,528
Inventory, Ore Stockpiles on Leach Pads, Gross	94,380	82,023
Inventory and Ore on Leach Pads	$ 227,958	$ 214,046