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Debt - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Apr. 30, 2019	Dec. 31, 2018	Jul. 31, 2017
Debt Instrument [Line Items]
Debt issuance costs for the 2026 Senior Unsecured Notes	$ 8,053			$ 8,214
Amortization of debt issuance costs	1,255	$ 1,223
Interest Expense
Debt Instrument [Line Items]
Amortization of debt issuance costs	1,000	$ 1,000
RBL Facility
Debt Instrument [Line Items]
Debt issuance costs for the RBL Facility	15,000			16,000
RBL Facility | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 1,500,000
Available borrowing capacity	391,000
Letters of credit outstanding	9,000			7,000
2026 Senior Unsecured Notes | Medium-term notes
Debt Instrument [Line Items]
Fair value of debt	$ 399,000			$ 368,000
Subsequent Event | RBL Facility | Line of credit
Debt Instrument [Line Items]
Borrowing base			$ 750,000
Elected commitment feature to increase borrowing base			$ 400,000

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- Definition

Line Of Credit Facility, Borrowing Capacity, Increase, New Maximum Eligible To Be Elected

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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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.

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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.

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

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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.

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