Stockholders' Equity (Details 2) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Western Coal Corp	Apr. 02, 2011 Western Coal Corp Common Stock
Stock issued in connection with the acquisition
Shares issued in connection with acquisition			8,951,558
Fair value of shares issued			$ 1,200,000,000
Cash payment on exercise (or expiration) of warrants	$ 11,535,000	$ 11,500,000
Shares issued upon exercise of warrants		18,938