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Equity Units Rollforward (Details) - shares		6 Months Ended		12 Months Ended
		Jun. 30, 2018		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		24,880,237		24,880,237	24,825,109		24,772,234
GP units issued to maintain 2% interest (in units)				434	1,102		1,057
General partner's ownership interest				2.00%	2.00%		2.00%
Unit-based compensation awards (in units)		21,220	[1]		54,026	[1]	51,818
Delek Holdings unit repurchases from public (in units)					0		0
Subordinated unit conversion (in units)							0
Ending balance (in units)				24,901,891	24,880,237		24,825,109
Units withheld for taxes (in units)				598	14,053		17,276
General Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		497,604		497,604	496,502		495,445
GP units issued to maintain 2% interest (in units)				434	1,102		1,057
Unit-based compensation awards (in units)	[1]			0	0		0
Delek Holdings unit repurchases from public (in units)					0		0
Subordinated unit conversion (in units)							0
Ending balance (in units)				498,038	497,604		496,502
Common - Public | Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		9,088,587		9,088,587	9,263,415		9,478,273
GP units issued to maintain 2% interest (in units)				0	0		0
Unit-based compensation awards (in units)	[1]			21,220	54,026		51,818
Delek Holdings unit repurchases from public (in units)					(228,854)		(266,676)
Subordinated unit conversion (in units)							0
Ending balance (in units)				9,109,807	9,088,587		9,263,415
Common - Delek Holdings | Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		15,294,046		15,294,046	15,065,192		2,799,258
GP units issued to maintain 2% interest (in units)				0	0		0
Unit-based compensation awards (in units)	[1]			0	0		0
Delek Holdings unit repurchases from public (in units)					228,854		266,676
Subordinated unit conversion (in units)							11,999,258
Ending balance (in units)				15,294,046	15,294,046		15,065,192
Subordinated | Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in units)		0		0	0		11,999,258
GP units issued to maintain 2% interest (in units)				0	0		0
Unit-based compensation awards (in units)	[1]			0	0		0
Delek Holdings unit repurchases from public (in units)					0		0
Subordinated unit conversion (in units)							(11,999,258)
Ending balance (in units)				0	0		0
[1] Unit-based compensation awards are presented net of 598, 14,053 and 17,276 units withheld for taxes as of December 31, 2018, 2017 and 2016, respectively.

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General Partner units issued to maintain 2% interest

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Previously issued common public units purchased by affiliated limited partner.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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