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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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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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