Inventory and Ore on Leach Pads (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory, Finished Goods, Net of Reserves	$ 12,621	$ 23,563
Other Inventory, Net of Reserves	36,871	40,870
Inventory, Supplies, Net of Reserves	48,617	50,498
Inventory, Net	98,109	114,931
Ore on Leach Pad, Current	68,695	48,204
Ore on leach pads, noncurrent	39,685	37,889
Inventory, Ore Stockpiles on Leach Pads, Gross	108,380	86,093
Inventory and Ore on Leach Pads	$ 206,489	$ 201,024