Inventory and Ore on Leach Pads (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 17,994	$ 16,165
Other Inventory, Net of Reserves	47,228	21,908
Inventory, Supplies, Net of Reserves	40,804	43,638
Inventory	106,026	81,711
Ore on Leach Pad, Current	64,167	67,329
Ore on leach pads, noncurrent	67,231	44,582
Inventory, Ore Stockpiles on Leach Pads, Gross	131,398	111,911
Inventory and Ore on Leach Pads	$ 237,424	$ 193,622