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Long-Term Debt - OMP Debt (Details) - USD ($)		3 Months Ended
	Mar. 22, 2021	Mar. 31, 2021	Mar. 21, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt		$ 674,238,000		$ 710,000,000
OMP Senior Notes | Senior Notes
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	$ 450,000,000.0		$ 575,000,000.0
Revolving Credit Facility | Credit Facility
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	450,000,000.0		575,000,000.0
Credit facility borrowing base	$ 500,000,000.0		$ 575,000,000.0
Revolving Credit Facility | OMP Credit Facility | Credit Facility
Debt Instrument [Line Items]
Debt obligation, maximum consolidated total leverage ratio	500.00%
Debt obligation, maximum senior secured leverage ratio	300.00%
Debt obligation, maximum consolidated interest coverage ratio	250.00%
Credit facility borrowing base		450,000,000.0
Total long-term debt		234,000,000.0
Letters of credit outstanding		5,500,000
Line of credit facility, remaining borrowing capacity		$ 210,500,000
Weighted average interest rate (percent)		2.10%
Revolving Credit Facility | OMP Credit Facility | Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee rates (percent)	0.375%
Revolving Credit Facility | OMP Credit Facility | Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee rates (percent)	0.50%
Revolving Credit Facility | The Credit Agreement | Credit Facility | Minimum | Eurodollar
Debt Instrument [Line Items]
Spread on variable rate (percent)		2.25%
Revolving Credit Facility | The Credit Agreement | Credit Facility | Minimum | Alternate Based Rate (ABR)
Debt Instrument [Line Items]
Spread on variable rate (percent)		1.25%
Revolving Credit Facility | The Credit Agreement | Credit Facility | Maximum | Eurodollar
Debt Instrument [Line Items]
Spread on variable rate (percent)		3.25%
Revolving Credit Facility | The Credit Agreement | Credit Facility | Maximum | Alternate Based Rate (ABR)
Debt Instrument [Line Items]
Spread on variable rate (percent)		2.25%

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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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