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Related Party Transactions - Throughput and Deficiency Agreement (Details)										3 Months Ended	9 Months Ended
	Aug. 12, 2020 USD ($)	May 12, 2020 USD ($)	May 01, 2020 USD ($)	Mar. 31, 2020 USD ($) bbl / d	Feb. 12, 2020 USD ($)	Nov. 12, 2019 USD ($)	Aug. 13, 2019 USD ($)	May 14, 2019 USD ($)	Feb. 12, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Related Party Transaction [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	$ 35,969,000	$ 30,878,000			$ 30,634,000	$ 30,379,000	$ 28,900,000	$ 27,400,000	$ 26,900,000		$ 47,558,000
Delek US and affiliates
Related Party Transaction [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	$ 28,100,000	$ 23,200,000			$ 22,600,000		$ 21,200,000	$ 20,000,000.0	$ 19,600,000
Throughput and Deficiency Agreement \| Delek US and affiliates
Related Party Transaction [Line Items]
Commitment To Minimum Revenue			$ 39,000,000.0
Shipments Committed On The Gathering System (in Bbd) \| bbl / d				120,000
Shipments Committed To Redelivery Point (in Bbd) \| bbl / d				50,000
Commitment To Connect Additional Receipt Points				$ 33,800,000
Return On The Actual Costs (in percent)				12.50%
Collaborative Arrangement, Term			10 years	10 years
Delek US \| Other long term liabilities \| Omnibus Agreement \| Delek US and affiliates
Related Party Transaction [Line Items]
Reimbursement of capital expenditures by Sponsor										$ 800,000	$ 600,000	$ 2,300,000