Inventory and Ore on Leach Pads (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 16,165	$ 23,563
Other Inventory, Net of Reserves	21,908	40,870
Inventory, Supplies, Net of Reserves	43,638	50,498
Inventory	81,711	114,931
Ore on Leach Pad, Current	67,329	48,204
Ore on leach pads, noncurrent	44,582	37,889
Inventory, Ore Stockpiles on Leach Pads, Gross	111,911	86,093
Inventory and Ore on Leach Pads	$ 193,622	$ 201,024