Asset Impairment (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Aug. 25, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges		$ 0	$ 37		$ 2,897,928	$ 23,081
Proceeds from sale of property, plant and equipment					1,776	$ 24,112
BCCT
Impaired Long-Lived Assets Held and Used [Line Items]
Proceeds from sale of property, plant and equipment	$ 25,000
Impairment charge recognized				$ 23,100
Mining Properties and Mineral Rights
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges					2,400,000
Property, Plant and Equipment
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges					$ 508,500