Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Related Party Transaction [Line Items]
Administrative Fee, Related Party		$ 2,500
Revenue from related parties		101,428		$ 89,025
Omnibus Agreement G & A Expenses, Related Party		600
Employee expenses reimbursed to related party		12,700		11,400
Reimbursements received from related parties		1,200		1,300
Accounts receivable due from HFC		41,600	$ 51,500
Accounts payable to HFC		10,741	7,725
Shortfall Payments, Revenue Recognized		2,200
Operating Lease, Lease Income		500		100
General partner interest	2.00%
Common Unit, Issued	37,250,000
Limited partner distribution	$ 2,500	66,551		39,632
Affiliated Entity
Related Party Transaction [Line Items]
Minimum annualized payments		332,700
Distributions to HEP unitholders		36,300		$ 30,300
Shortfall Payments
Related Party Transaction [Line Items]
Shortfall Billings Deferred Revenue		$ 900	$ 4,400