Inventory and Ore on Leach Pads (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 16,567	$ 16,165
Other Inventory, Net of Reserves	33,290	21,908
Inventory, Supplies, Net of Reserves	39,904	43,638
Inventory	89,761	81,711
Ore on Leach Pad, Current	70,446	67,329
Ore on leach pads, noncurrent	63,034	44,582
Inventory, Ore Stockpiles on Leach Pads, Gross	133,480	111,911
Inventory and Ore on Leach Pads	$ 223,241	$ 193,622