Subsequent Events (Notes)	9 Months Ended
Sep. 30, 2014
Subsequent Events [Abstract]
Subsequent Events [Text Block]	11. Subsequent Events On October 7, 2014, a fifth amendment to the credit agreement governing the revolving credit facility (the “Fifth Amendment”) was executed. The Fifth Amendment (i) permitted the Company to increase or decrease the aggregate principal amount of the commitments of the lenders under the credit agreement governing the revolving credit facility provided that the aggregate commitments do not exceed the then existing borrowing base, (ii) increased the letter of credit facility from $15.0 million to $30.0 million, (iii) established an approved borrowing base of $675.0 million until the next redetermination and (iv) amended the availability of issuances of additional senior notes. As a result of the Fall 2014 borrowing base redetermination, effective October 7, 2014, the borrowing base was increased to $675.0 million from $570.0 million. However, the Company voluntarily elected to limit the lenders’ aggregate commitment to $585.0 million. Prior to giving effect to the amendment, the revolving credit facility provided availability for issuances of additional senior notes in the aggregate principal amount of up to $350.0 million. The amendment replaced this limitation to permit unlimited issuances of additional senior notes as long as, subject to certain other conditions described therein, after giving effect to the issuance of the additional senior notes, the Company is in compliance with our financial covenants under the credit agreement governing our revolving credit facility. On October 24, 2014, the Company completed the acquisition of oil and gas properties from Eagle Ford Minerals, LLC (“EFM”) primarily in LaSalle, Atascosa and McMullen Counties, Texas in the Eagle Ford Shale (the “Eagle Ford Shale Transaction”). The transaction had an effective date of October 1, 2014, with an adjusted purchase price of $243.0 million, which represents an agreed upon price of $250.0 million less working capital adjustments. The Company paid approximately $93.0 million at closing, which was funded from borrowings under the revolving credit facility that were repaid with net proceeds from the senior note offering discussed below. The Company is required to pay the remaining $150.0 million no later than February 16, 2015, which will be funded with borrowings under the revolving credit facility. Prior to the acquisition, the Company and EFM were joint working interest owners in the properties that were subject to the transaction, for which the Company acted as the operator and owned an approximate 75% working interest in nearly all of such properties. After giving effect to the transaction, the Company holds an approximate 100% working interest in nearly all of the acquired properties.

11. Subsequent Events

On October 7, 2014, a fifth amendment to the credit agreement governing the revolving credit facility (the “Fifth Amendment”) was executed. The Fifth Amendment (i) permitted the Company to increase or decrease the aggregate principal amount of the commitments of the lenders under the credit agreement governing the revolving credit facility provided that the aggregate commitments do not exceed the then existing borrowing base, (ii) increased the letter of credit facility from $15.0 million to $30.0 million, (iii) established an approved borrowing base of $675.0 million until the next redetermination and (iv) amended the availability of issuances of additional senior notes. As a result of the Fall 2014 borrowing base redetermination, effective October 7, 2014, the borrowing base was increased to $675.0 million from $570.0 million. However, the Company voluntarily elected to limit the lenders’ aggregate commitment to $585.0 million. Prior to giving effect to the amendment, the revolving credit facility provided availability for issuances of additional senior notes in the aggregate principal amount of up to $350.0 million. The amendment replaced this limitation to permit unlimited issuances of additional senior notes as long as, subject to certain other conditions described therein, after giving effect to the issuance of the additional senior notes, the Company is in compliance with our financial covenants under the credit agreement governing our revolving credit facility.

On October 24, 2014, the Company completed the acquisition of oil and gas properties from Eagle Ford Minerals, LLC (“EFM”) primarily in LaSalle, Atascosa and McMullen Counties, Texas in the Eagle Ford Shale (the “Eagle Ford Shale Transaction”). The transaction had an effective date of October 1, 2014, with an adjusted purchase price of $243.0 million, which represents an agreed upon price of $250.0 million less working capital adjustments. The Company paid approximately $93.0 million at closing, which was funded from borrowings under the revolving credit facility that were repaid with net proceeds from the senior note offering discussed below. The Company is required to pay the remaining $150.0 million no later than February 16, 2015, which will be funded with borrowings under the revolving credit facility. Prior to the acquisition, the Company and EFM were joint working interest owners in the properties that were subject to the transaction, for which the Company acted as the operator and owned an approximate 75% working interest in nearly all of such properties. After giving effect to the transaction, the Company holds an approximate 100% working interest in nearly all of the acquired properties.