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Acquisitions and Divestitures (Details Textual) (USD $)
1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Apr. 30, 2012
Jun. 30, 2012
Common Stock [Member]
Apr. 30, 2012
Cordillera Energy Partners [Member]
acre
Jun. 30, 2012
Cordillera Energy Partners [Member]
Jan. 31, 2012
Burrup Holdings Limited [Member]
Jun. 30, 2012
Yara International [Member]
Acquisitions and Divestitures (Textual) [Abstract]            
Business combination land acquired in acres     312,000      
Raising net proceeds, common stock 6,272,667 6,272,667        
Cash consideration       $ 2,600,000,000    
Percentage of ownership         49.00%  
Ownership percentage by other party           51.00%
Amount paid for acquisition         $ 439,000,000