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Debt - Financial Covenants (Details) - Wells Fargo [Member] - Revolving Credit Agreement [Member]
$ in Thousands
Jun. 30, 2016
USD ($)
Line of Credit Facility [Line Items]  
Ratio of total debt to EBITDAX, not greater than 4.0 4.0
Ratio of current assets to liabilities, not less than 1.0 1.0
Maximum issuance of unsecured debt $ 250,000
Reduction of borrowing base 25.00%