Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Affiliates	$ 333,116	$ 292,221	$ 275,196
Due from Affiliates	42,562	32,482
Due to Affiliate, Current	$ 16,424	11,635
Ownership percentage in equity method investment	50.00%
Property, Plant and Equipment, Additions	$ 103,823	193,121	198,686
Payments to Acquire Productive Assets	317,500	62,000	0
HFC [Member]
Related Party Transaction [Line Items]
Minimum Annualized Payments Receivable	321,000
Annual Administrative Fee [Member]
Related Party Transaction [Line Items]
Costs and Expenses, Related Party	2,500	2,400	2,300
Reimbursements Paid [Member]
Related Party Transaction [Line Items]
Expenses resulting from agreement with related party	40,900	34,500	38,900
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Reimbursements paid to related parties	14,000	13,500	16,800
Cash Distribution Paid	105,200	90,400	80,500
Shortfall payments billed [Domain]
Related Party Transaction [Line Items]
Affiliates	6,100	7,300	$ 10,100
Deferred Revenue, Additions	5,600	$ 6,400
Tulsa Tanks [Member]
Related Party Transaction [Line Items]
Property, Plant and Equipment, Additions	$ 39,500
Cheyenne [Member]
Related Party Transaction [Line Items]
Ownership percentage in equity method investment	50.00%
Payments to Acquire Productive Assets	$ 278,000