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Revolving Credit Facility (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Feb. 04, 2021 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving credit facility | $ 93,000 |  | $ 93,000 |  | $ 122,500
Debt Instrument, Covenant Description |  |  | (a) total funded debt, as defined in the Credit Agreement, to 12-month trailing adjusted EBITDAX ratio cannot be greater than 4.00 to 1.00 on the last day of each fiscal quarter; and (b) adjusted current ratio, as defined in the Credit Agreement, cannot be less than 1.00 to 1.00 as of the last day of any fiscal quarter. |  |
Line of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, maximum loan amount | 2,500,000 |  | $ 2,500,000 |  |
Line of credit agreement, current borrowing base | 1,100,000 |  | 1,100,000 |  |
Line of credit agreement, aggregate lender commitment amount | $ 1,100,000 |  | 1,100,000 |  | 1,200,000
Line of Credit Facility, Dividend Restrictions | 12.0 million | 50.0 million |  |  |
Revolving credit facility | $ 93,000 |  | 93,000 |  | 122,500
Letters of credit | 42,000 |  | 42,000 |  | 0
Available borrowing capacity | 965,000 |  | 965,000 |  | 1,077,500
Credit facility, unamortized deferred financing costs | $ 4,300 |  | $ 4,300 |  | $ 5,900
Line of Credit [Member] | Subsequent Event [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, aggregate lender commitment amount |  |  |  | $ 1,100,000 |
Revolving credit facility |  |  |  | 121,500 |
Letters of credit |  |  |  | 42,000 |
Available borrowing capacity |  |  |  | $ 936,500 |
Line of Credit [Member] | Borrowing Base Utilization of 25 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, unused capacity, commitment fee rate | 0.375% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization of 25 Percent [Member] | Eurodollar [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 1.75% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization of 25 Percent [Member] | Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 0.75% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 25 Percent Or More But Less Than 50 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, unused capacity, commitment fee rate | 0.375% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 25 Percent Or More But Less Than 50 Percent [Member] | Eurodollar [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 2.00% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 25 Percent Or More But Less Than 50 Percent [Member] | Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 1.00% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 50 Percent Or More But Less Than 75 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, unused capacity, commitment fee rate | 0.50% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 50 Percent Or More But Less Than 75 Percent [Member] | Eurodollar [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 2.50% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 50 Percent Or More But Less Than 75 Percent [Member] | Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 1.50% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 75 Percent Or More But Less Than 90 Percent [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, unused capacity, commitment fee rate | 0.50% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 75 Percent Or More But Less Than 90 Percent [Member] | Eurodollar [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 2.75% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 75 Percent Or More But Less Than 90 Percent [Member] | Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 1.75% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 90 Percent Or More [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, unused capacity, commitment fee rate | 0.50% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 90 Percent Or More [Member] | Eurodollar [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 3.00% |  |  |  |
Line of Credit [Member] | Borrowing Base Utilization Of 90 Percent Or More [Member] | Debt Instrument Variable Rate, Alternative Base Rate, And Swingline Loans [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit agreement, basis spread on variable rate | 2.00% |  |  |  |

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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition Description of restrictions on the entity's ability to pay dividends as required by the terms of the credit facility. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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