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Related Party Transactions Quarterly Cash Distributions Paid (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 12, 2019
Jan. 24, 2019
Nov. 09, 2018
Aug. 13, 2018
May 15, 2018
Feb. 12, 2018
Nov. 14, 2017
Aug. 11, 2017
May 12, 2017
Feb. 14, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]                          
Cash distributions paid     $ 25,960 $ 24,984 $ 23,997 $ 22,777 $ 22,270 $ 21,783 $ 21,024 $ 20,537 $ 101,900 $ 87,900 $ 75,000
Subsequent Event                          
Related Party Transaction [Line Items]                          
Cash distributions paid $ 26,949 $ 26,900                      
Delek                          
Related Party Transaction [Line Items]                          
Cash distributions paid                     $ 70,100 $ 60,100 $ 47,000
Delek | Subsequent Event                          
Related Party Transaction [Line Items]                          
Cash distributions declared $ 19,600