Inventory and Ore on Leach Pads (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 19,932	$ 16,165
Other Inventory, Net of Reserves	22,505	21,908
Inventory, Supplies, Net of Reserves	41,637	43,638
Inventory	84,074	81,711
Ore on Leach Pad, Current	76,335	67,329
Ore on leach pads, noncurrent	52,885	44,582
Inventory, Ore Stockpiles on Leach Pads, Gross	129,220	111,911
Inventory and Ore on Leach Pads	$ 213,294	$ 193,622