Inventory and Ore on Leach Pads (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 13,476	$ 17,994
Other Inventory, Net of Reserves	20,938	47,228
Inventory, Supplies, Net of Reserves	39,346	40,804
Inventory	73,760	106,026
Ore on Leach Pad, Current	66,585	64,167
Ore on leach pads, noncurrent	72,461	67,231
Inventory, Ore Stockpiles on Leach Pads, Gross	139,046	131,398
Inventory and Ore on Leach Pads	$ 212,806	$ 237,424