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Related Party Transactions Quarterly Cash Distributions Paid (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 12, 2018
Jan. 23, 2018
Nov. 14, 2017
Aug. 11, 2017
May 12, 2017
Jan. 24, 2017
Nov. 14, 2016
Aug. 12, 2016
May 13, 2016
Feb. 12, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]                          
Cash distributions paid     $ 22,270 $ 21,783 $ 21,024 $ 20,537 $ 19,302 $ 18,085 $ 17,095 $ 16,124      
Subsequent Event                          
Related Party Transaction [Line Items]                          
Cash distributions paid $ 22,777                        
Delek                          
Related Party Transaction [Line Items]                          
Cash distributions paid                     $ 60,100 $ 47,000 $ 35,900
Delek | Subsequent Event                          
Related Party Transaction [Line Items]                          
Cash distributions declared   $ 16,200