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Long-Term Debt Revolving Credit Facility (Details) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Oct. 26, 2016 USD ($) | Oct. 04, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Percentage of Proved Property Secured for Credit Facility Borrowing |  | 90.00% |  |  |  |
Long-term Line of Credit, Noncurrent |  | $ 0 |  |  |  | $ 202,000
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowing Base, Line of Credit |  | 1,110,000 |  |  | $ 1,250,000 |
Line of Credit Facility, Current Borrowing Capacity |  | 1,106,875 |  |  | $ 1,250,000 | 1,500,000
Percentage of Proved Property Secured for Credit Facility Borrowing |  |  |  |  | 90.00% |
Debt Issuance Costs, Gross |  |  |  |  | $ 3,100 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,500,000 |  |  |  |
Long-term Line of Credit, Noncurrent | [1] | 0 |  |  |  | 202,000
Letters of Credit Outstanding, Amount | [2] | 200 |  |  |  | 200
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,106,675 |  |  |  | $ 1,297,800
Borrowing Base Utilization Of 25 Percent Or Less [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.30% |  |  |  |
Borrowing Base Utilization Of 25 Percent Or Less [Member] | Eurodollar [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |
Borrowing Base Utilization Of 25 Percent Or Less [Member] | Prime Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |  |  |
Borrowing Base Utilization Of More Than 25 Percent But Less Than 50 Percent [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.30% |  |  |  |
Borrowing Base Utilization Of More Than 25 Percent But Less Than 50 Percent [Member] | Eurodollar [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |  |
Borrowing Base Utilization Of More Than 25 Percent But Less Than 50 Percent [Member] | Prime Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |  |  |  |
Borrowing Base Utilization Of More Than 50 Percent But Less Than 75 Percent [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.35% |  |  |  |
Borrowing Base Utilization Of More Than 50 Percent But Less Than 75 Percent [Member] | Eurodollar [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |
Borrowing Base Utilization Of More Than 50 Percent But Less Than 75 Percent [Member] | Prime Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |
Borrowing Base Utilization Of More Than 75 Percent But Less Than 90 Percent [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375% |  |  |  |
Borrowing Base Utilization Of More Than 75 Percent But Less Than 90 Percent [Member] | Eurodollar [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |
Borrowing Base Utilization Of More Than 75 Percent But Less Than 90 Percent [Member] | Prime Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |
Borrowing Base Utilization Of More Than 90 Percent [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375% |  |  |  |
Borrowing Base Utilization Of More Than 90 Percent [Member] | Eurodollar [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.75% |  |  |  |
Borrowing Base Utilization Of More Than 90 Percent [Member] | Prime Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |
Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Covenant Compliance, Senior Secured Debt To Adjusted EBITDAX Ratio |  | 2.75 |  |  |  |
Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Covenant Compliance, Adjusted Current Ratio |  | 1.0 |  |  |  |
Debt Instrument, Covenant Compliance, Adjusted EBITDAX To Interest Expense |  | 2.0 |  |  |  |
Subsequent Event [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowing Base, Line of Credit |  |  |  | $ 1,350,000 |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 1,250,000 |  |
Long-term Line of Credit, Noncurrent | [1] |  | $ 0 |  |  |
Letters of Credit Outstanding, Amount | [2] |  | 200 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 1,249,800 |  |  |
[1] | Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and thus are not deducted from the credit facility balance.
[2] | Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.

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- Definition Value of assets pledged as collateral under line of credit agreement, net of certain company liabilities + References No definition available. + Details
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- Definition Percentage of Proved Property Secured for Credit Facility Borrowing + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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