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Long-term Debt Revolving Credit Facility (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Feb. 17, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Percentage of Proved Oil and Gas Properties Secured for Credit Facility Borrowing |  | 75.00% |  |  |
Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Line of Credit | [1] | $ 202,000 |  |  | $ 166,000
Letters of Credit Outstanding, Amount | [2] | 200 |  |  | 808
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,297,800 |  |  | $ 1,333,192
Line of Credit [Member] | Borrowing Base Utilization of 25 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.30% |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of More Than 25 Percent But Less Than 50 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.30% |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of More Than 50 Percent But Less Than 75 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.35% |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of More Than 75 Percent But Less Than 90 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375% |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of More Than 90 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375% |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 2,500,000 |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | 1,500,000 |  |  |
Borrowing Base, Line of Credit |  | $ 2,000,000 |  | $ 2,400,000 |
Subsequent Event [Member] | Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Line of Credit | [1] |  | $ 243,000 |  |
Letters of Credit Outstanding, Amount | [2] |  | 200 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 1,256,800 |  |
Eurodollar [Member] | Line of Credit [Member] | Borrowing Base Utilization of 25 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |
Eurodollar [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 25 Percent But Less Than 50 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |
Eurodollar [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 50 Percent But Less Than 75 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |
Eurodollar [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 75 Percent But Less Than 90 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |
Eurodollar [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 90 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |
Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] | Line of Credit [Member] | Borrowing Base Utilization of 25 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.25% |  |  |
Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 25 Percent But Less Than 50 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50% |  |  |
Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 50 Percent But Less Than 75 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |  |
Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 75 Percent But Less Than 90 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |  |  |
Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] | Line of Credit [Member] | Borrowing Base Utilization Of More Than 90 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |
Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument Covenant Compliance Debt To Adjusted EBITDAX Ratio |  | 4.0 |  |  |
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 |  |  |
[1] | 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 reduce the amount available under the credit facility on a dollar-for-dollar basis.

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- Definition Percentage of Proved Oil and Gas Properties Secured for Credit Facility Borrowing + References No definition available. + 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 The carrying value as of the balance sheet date of the current and noncurrent portions 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + 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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