Bond Repurchase Program, Authorized Amount

No definition available.

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- Definition

Debt Instrument, Covenant, Distributions To Parent Company, Maximum Pro Forma Leverage Ratio Allowable

+ References

No definition available.

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- Definition

Debt Instrument, Covenant, Distributions To Parent Company, Minimum Remaining Borrowing Capacity Required, Percentage

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Maximum Leverage Ratio

+ References

No definition available.

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- Definition

Debt Instrument, Covenant, Minimum Current Ratio

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No definition available.

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- Definition

Debt Instrument, Covenant, Reduction In Borrowing Base If Unsecured Debt Is Incurred, Percentage

+ References

No definition available.

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- Definition

Debt Instrument, Covenant, Repurchase Of Equity And Debt, Maximum Pro Forma Leverage Ratio Allowable

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Repurchase Of Equity And Debt, Minimum Remaining Borrowing Capacity Required, Percentage

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Redemption Price, Percentage In event Of Change In Control

+ References

No definition available.

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Period Type:	duration

- Definition

Line Of Credit Facility, Initial Borrowing Commitment

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Mortgage Held By Lender, Percentage Of Value Of Oil And Gas Reserves

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Ratio Of Current Assets To Current Liabilities

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 28
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-SubTopic 30
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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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Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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- Definition

Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

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Balance Type:	credit
Period Type:	instant

- 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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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 fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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Debt - Narrative (Details)		1 Months Ended	2 Months Ended	10 Months Ended	12 Months Ended
Debt - Narrative (Details)	Jul. 31, 2017 USD ($)	Feb. 28, 2018 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 27, 2020 USD ($)
Debt Instrument [Line Items]
Debt issuance costs for the 2026 Senior Unsecured Notes					$ 7,531,000	$ 8,214,000
Amortization of debt issuance costs			$ 416,000	$ 1,988,000	5,059,000	5,430,000
Maximum pro forma leverage ratio allowable which will permit repurchase of equity and indebtedness	2.75
Mortgage held on present value of proven oil and gas reserves	85.00%
Net proceeds from issuance of debt			0	0	$ 0	400,000,000
Minimum availability of borrowing base required which will permit distributions to parent company					10.00%
RBL Facility
Debt Instrument [Line Items]
Debt issuance costs for the RBL Facility					$ 11,000,000	16,000,000
Medium-term notes \| 2026 Notes
Debt Instrument [Line Items]
Fair value of debt					376,000,000	$ 368,000,000
Interest rate						7.00%
Line of credit \| RBL Facility
Debt Instrument [Line Items]
Borrowings outstanding					2,000,000
Unsecured debt \| 2026 Notes
Debt Instrument [Line Items]
Principal amount of debt issued		$ 400,000,000
Interest rate		7.00%
Net proceeds from issuance of debt		$ 391,000,000
Aggregate principal amount able to be redeemed		35.00%
Redemption price in event of change in control		101.00%
Line of credit \| RBL Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,500,000,000.0
Borrowing base					500,000,000
Initial borrowing commitment					400,000,000
Letters of credit outstanding					7,000,000
Available borrowing capacity					$ 391,000,000
Commitment fee	0.50%
Leverage ratio (no more than)	4.00
Current ratio (at least)	1.00
Leverage ratio at period end					1.38
Current ratio at period end					3.18
Reduction in borrowing base if unsecured indebtedness is incurred	25.00%
Minimum availability of borrowing base required which will permit repurchase of equity and indebtedness	15.00%
Maximum pro forma leverage ratio allowable which will permit distributions to parent company					3.00
Letters of credit \| RBL Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000,000
LIBOR \| Minimum \| Line of credit \| RBL Facility
Debt Instrument [Line Items]
Applicable margin	2.50%
LIBOR \| Maximum \| Line of credit \| RBL Facility
Debt Instrument [Line Items]
Applicable margin	3.50%
Customary base rate \| Minimum \| Line of credit \| RBL Facility
Debt Instrument [Line Items]
Applicable margin	1.50%
Customary base rate \| Maximum \| Line of credit \| RBL Facility
Debt Instrument [Line Items]
Applicable margin	2.50%
On or after February 15, 2021 \| Unsecured debt \| 2026 Notes
Debt Instrument [Line Items]
Redemption price		107.00%
Prior to February 15, 2021 \| Unsecured debt \| 2026 Notes
Debt Instrument [Line Items]
Redemption price		100.00%
Interest expense
Debt Instrument [Line Items]
Amortization of debt issuance costs			$ 0	$ 2,000,000	$ 5,000,000	$ 5,000,000
Subsequent Event
Debt Instrument [Line Items]
Bond repurchase program, authorized amount							$ 75,000,000