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Commitments and Contingencies (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 27, 2015
USD ($)
Jun. 30, 2015
a
Jun. 30, 2015
USD ($)
a
Jun. 30, 2014
USD ($)
Jan. 21, 2014
a
Water Rights Litigation Mt. Emmons Project [Abstract]          
Period for proposal submission   6 years      
Gas and Oil Acreage [Line Items]          
Gross acres acquired in acquisition (in acres)         160
Working interest percentage (in hundredths)         50.00%
Proceeds from Legal Settlements | $     $ 1,500 $ 0  
Dimmit Wood Properties Ltd [Member]          
Gas and Oil Acreage [Line Items]          
Gross acres acquired in acquisition (in acres)   800.77 800.77    
Working interest percentage (in hundredths)   30.00% 30.00%    
Crimson and Liberty [Member]          
Gas and Oil Acreage [Line Items]          
Proceeds from Legal Settlements | $ $ 1,500