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Long-Term Debt - OMP Credit Facility (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Mar. 22, 2021	Sep. 30, 2021	Sep. 30, 2021	Mar. 21, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt		$ 1,041,895	$ 1,041,895		$ 710,000
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	450,000
Total long-term debt		210,000	210,000
Letters of credit outstanding		5,500	5,500
Line of credit facility, remaining borrowing capacity		$ 234,500	$ 234,500
Weighted average interest rate (percent)		2.50%	2.40%
OMP Credit Facility | Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage			0.375%
OMP Credit Facility | Credit Facility | Minimum | Eurodollar
Debt Instrument [Line Items]
Spread on variable rate (percent)			2.25%
OMP Credit Facility | Credit Facility | Minimum | Alternate Based Rate (ABR)
Debt Instrument [Line Items]
Spread on variable rate (percent)			1.25%
OMP Credit Facility | Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage			0.50%
OMP Credit Facility | Credit Facility | Maximum | Eurodollar
Debt Instrument [Line Items]
Spread on variable rate (percent)			3.25%
OMP Credit Facility | Credit Facility | Maximum | Alternate Based Rate (ABR)
Debt Instrument [Line Items]
Spread on variable rate (percent)			2.25%
OMP Senior Notes | Senior Notes
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	$ 450,000			$ 575,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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