Inventory and Ore on Leach Pads (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 10,746	$ 17,994
Other Inventory, Net of Reserves	18,957	47,228
Inventory, Supplies, Net of Reserves	38,192	40,804
Inventory	67,895	106,026
Ore on Leach Pad, Current	75,699	64,167
Ore on leach pads, noncurrent	69,954	67,231
Inventory, Ore Stockpiles on Leach Pads, Gross	145,653	131,398
Inventory and Ore on Leach Pads	$ 213,548	$ 237,424