Subsequent Events	12 Months Ended
Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration On February 26, 2018, Delek's Board of Directors voted to declare a quarterly cash dividend of $0.20 per share, payable on March 26, 2018, to stockholders of record on March 12, 2018. Our previous quarterly cash dividend amounts were $0.15 per share. Share Repurchase from Alon Israel/New Share Repurchase Program On January 23, 2018, Delek repurchased 2.0 million shares of its common stock from Alon Israel in connection with Delek’s rights pursuant to a Stock Purchase Agreement dated April 14, 2015, by and between Delek and Alon Israel. Alon Israel delivered a right of first offer notice to Delek on January 16, 2018, informing Delek of Alon Israel’s intention to sell the 2.0 million shares, and Delek accepted such offer on January 17, 2018. The total purchase price was approximately $75.3 million, or $37.64 per share. As of February 25, 2018, there was approximately $32.2 million remaining under Delek's $150.0 million December 2016 share repurchase authorization, taking into account the share repurchase from Alon Israel discussed above. On February 26, 2018, the Board of Directors approved a new $150.0 million authorization to repurchase Delek common stock. This amount has no expiration date and is in addition to any remaining amounts previously authorized. These shares will be included in treasury shares in the period in which they were repurchased. Acquisition of Non-controlling Interest in Alon Partnership On November 8, 2017, Delek and the Alon Partnership entered into a definitive merger agreement under which Delek agreed to acquire all of the outstanding limited partner units which Delek did not already own in an all-equity transaction. This transaction was approved by all voting members of the board of directors of the general partner of the Alon Partnership upon the recommendation from its conflicts committee and by the board of directors of Delek. This transaction closed on February 7, 2018. Delek owned approximately 51.0 million limited partner units of the Alon Partnership, or approximately 81.6% of the outstanding units immediately prior to the transaction date. Under terms of the merger agreement, the owners of the remaining outstanding units in the Alon Partnership that Delek did not currently immediately prior to the transaction date received a fixed exchange ratio of 0.49 shares of New Delek common stock for each limited partner unit of the Alon Partnership, resulting in the issuance of approximately 5.6 million shares to the public unitholders of the Alon Partnership. Reenactment of the Blenders Tax Credit On February 9, 2018, as part of the Bipartisan Budget Act of 2018 (H.R. 1892), an extension to the blenders tax credit for biodiesel and renewable diesel was enacted. This extension is retroactive to January 1, 2017 and is effective for one year. As a result of the retroactive application, we expect to recognize a tax benefit during the first quarter of 2018 related to credits earned upon enactment in 2018 by our renewable fuels refinery (included in the California Discontinued Entities as of December 31, 2017) for refining activities that occurred during 2017, but the amount of the expected credit has not yet been determined. Agreement to Sale of Asphalt Terminals On February 12, 2018, Delek announced it has reached a definitive agreement to sell four asphalt terminals (included in Delek's corporate/other segment) to an affiliate of Andeavor. This transaction includes asphalt terminal assets in Bakersfield, Mojave and Elk Grove, California and Phoenix, Arizona, as well as Delek’s 50 percent equity interest in the Paramount-Nevada Asphalt Company, LLC joint venture that operates an asphalt terminal located in Fernley, Nevada. The total cash consideration is $75.0 million plus a working capital adjustment. Subject to customary closing conditions, certain preferential rights under the joint venture arrangement and regulatory approvals, this transaction is expected to close in the first half of 2018. These assets did not meet the definition of held for sale pursuant to ASC 360 as of December 31, 2017 and therefore were not reflected as held for sale nor as discontinued operations in the consolidated financial statements as of and for the year ended December 31, 2017. Transaction with Delek Logistics On February 26, 2018, Delek and Delek Logistics entered into a definitive agreement whereby Delek Logistics will acquire the Big Spring logistics assets, subject to customary closing conditions. These assets consist of storage tanks and terminals that support our Big Spring, Texas refinery. In addition, a new marketing agreement will be entered into between the companies for product sales from Big Spring. The expected purchase price is approximately $315.0 million in cash. This dropdown is expected to be financed by Delek Logistics through a combination of cash on hand and borrowings on the revolving credit facility and is expected to close in March 2018.

Subsequent Events

Dividend Declaration

On February 26, 2018, Delek's Board of Directors voted to declare a quarterly cash dividend of $0.20 per share, payable on March 26, 2018, to stockholders of record on March 12, 2018. Our previous quarterly cash dividend amounts were $0.15 per share.

Share Repurchase from Alon Israel/New Share Repurchase Program

On January 23, 2018, Delek repurchased 2.0 million shares of its common stock from Alon Israel in connection with Delek’s rights pursuant to a Stock Purchase Agreement dated April 14, 2015, by and between Delek and Alon Israel. Alon Israel delivered a right of first offer notice to Delek on January 16, 2018, informing Delek of Alon Israel’s intention to sell the 2.0 million shares, and Delek accepted such offer on January 17, 2018. The total purchase price was approximately $75.3 million, or $37.64 per share.

As of February 25, 2018, there was approximately $32.2 million remaining under Delek's $150.0 million December 2016 share repurchase authorization, taking into account the share repurchase from Alon Israel discussed above. On February 26, 2018, the Board of Directors approved a new $150.0 million authorization to repurchase Delek common stock. This amount has no expiration date and is in addition to any remaining amounts previously authorized. These shares will be included in treasury shares in the period in which they were repurchased.

Acquisition of Non-controlling Interest in Alon Partnership

On November 8, 2017, Delek and the Alon Partnership entered into a definitive merger agreement under which Delek agreed to acquire all of the outstanding limited partner units which Delek did not already own in an all-equity transaction. This transaction was approved by all voting members of the board of directors of the general partner of the Alon Partnership upon the recommendation from its conflicts committee and by the board of directors of Delek. This transaction closed on February 7, 2018. Delek owned approximately 51.0 million limited partner units of the Alon Partnership, or approximately 81.6% of the outstanding units immediately prior to the transaction date. Under terms of the merger agreement, the owners of the remaining outstanding units in the Alon Partnership that Delek did not currently immediately prior to the transaction date received a fixed exchange ratio of 0.49 shares of New Delek common stock for each limited partner unit of the Alon Partnership, resulting in the issuance of approximately 5.6 million shares to the public unitholders of the Alon Partnership.

Reenactment of the Blenders Tax Credit

On February 9, 2018, as part of the Bipartisan Budget Act of 2018 (H.R. 1892), an extension to the blenders tax credit for biodiesel and renewable diesel was enacted. This extension is retroactive to January 1, 2017 and is effective for one year. As a result of the retroactive application, we expect to recognize a tax benefit during the first quarter of 2018 related to credits earned upon enactment in 2018 by our renewable fuels refinery (included in the California Discontinued Entities as of December 31, 2017) for refining activities that occurred during 2017, but the amount of the expected credit has not yet been determined.

Agreement to Sale of Asphalt Terminals

On February 12, 2018, Delek announced it has reached a definitive agreement to sell four asphalt terminals (included in Delek's corporate/other segment) to an affiliate of Andeavor. This transaction includes asphalt terminal assets in Bakersfield, Mojave and Elk Grove, California and Phoenix, Arizona, as well as Delek’s 50 percent equity interest in the Paramount-Nevada Asphalt Company, LLC joint venture that operates an asphalt terminal located in Fernley, Nevada. The total cash consideration is $75.0 million plus a working capital adjustment. Subject to customary closing conditions, certain preferential rights under the joint venture arrangement and regulatory approvals, this transaction is expected to close in the first half of 2018. These assets did not meet the definition of held for sale pursuant to ASC 360 as of December 31, 2017 and therefore were not reflected as held for sale nor as discontinued operations in the consolidated financial statements as of and for the year ended December 31, 2017.

Transaction with Delek Logistics

On February 26, 2018, Delek and Delek Logistics entered into a definitive agreement whereby Delek Logistics will acquire the Big Spring logistics assets, subject to customary closing conditions. These assets consist of storage tanks and terminals that support our Big Spring, Texas refinery. In addition, a new marketing agreement will be entered into between the companies for product sales from Big Spring. The expected purchase price is approximately $315.0 million in cash. This dropdown is expected to be financed by Delek Logistics through a combination of cash on hand and borrowings on the revolving credit facility and is expected to close in March 2018.