Quarterly report pursuant to Section 13 or 15(d)

Property And Equipment (Narrative) (Details)

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Property And Equipment (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Oct. 31, 2012
Oct. 11, 2012
May. 07, 2012
Property, Plant and Equipment [Line Items]                  
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool   $ 86,200   $ 86,200          
Capitalized general and administrative costs   6,300 $ 6,900 13,500 $ 13,200        
Capitalized costs of oil and natural gas properties excluded from amortization   $ 1,797,025   1,797,025   $ 1,465,538      
Payment received from Diamondback       $ (17,237) $ 48,631        
Diamondback [Member]                  
Property, Plant and Equipment [Line Items]                  
Investment (shares)               7,914,036  
Promissory note receivable               $ 63,600  
Ownership interest             21.40%   35.00%
Diamondback [Member] | Accounts Receivable - Related Party [Member]                  
Property, Plant and Equipment [Line Items]                  
Payment received from Diamondback $ 18,600                
Minimum [Member]                  
Property, Plant and Equipment [Line Items]                  
Expected number of years amortization will commence       3 years          
Maximum [Member]                  
Property, Plant and Equipment [Line Items]                  
Expected number of years amortization will commence       5 years