Investments in Non-Controlled Entities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Proceeds from sale and disposition of assets			$ 579,448	$ 44,303
Gain on sale of asset	$ 353,797	$ 18,505	353,797	18,505
Revenues	638,020	572,848	1,960,890	1,834,362
Operating	172,115	165,368	475,256	442,254
Cost of product sales	120,510	121,819	473,781	440,670
Trade accounts receivable	137,618		137,618		$ 138,779
Other accounts receivable	24,025		24,025		14,561
Change in Equity Method Investments [Roll Forward]
Investments at December 31, 2017			1,082,511
Additional investment			147,048
Sale of ownership interest in BridgeTex			(205,776)
Other adjustments			502
Proportionate share of earnings			132,647
Amortization of excess investment and capitalized interest			(1,804)
Earnings of non-controlled entities	53,795	31,151	130,843	78,173
Distributions from operations of non-controlled entities			147,950	97,691
Distributions from returns of investments in non-controlled entities			1,786	52,738
Investments at September 30, 2018	1,005,392		1,005,392
Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	488,775	446,935	1,392,960	1,272,845
Product [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	144,403	121,010	552,792	548,634
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	$ 900	700	$ 2,600	3,100
BridgeTex [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	30.00%		30.00%
Equity Method Investment Sold Percentage	20.00%		20.00%
Proceeds from sale and disposition of assets			$ 578,500
Gain on sale of asset			353,800
BridgeTex [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Trade accounts receivable	$ 200		200
Other accounts receivable	100		100
BridgeTex [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 9,900	9,100	$ 29,500	27,000
Double Eagle Pipeline Llc [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Double Eagle Pipeline Llc [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Trade accounts receivable	$ 300		$ 300		500
Double Eagle Pipeline Llc [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 1,000	1,300	$ 3,900	3,100
HoustonLink Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
HoustonLink Pipeline Company LLC [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Accounts Payable, Other, Current					100
MVP Terminalling, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
MVP Terminalling, LLC [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Other accounts receivable	$ 1,200		$ 1,200		400
Powder Springs Logistics, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Powder Springs Logistics, LLC [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Cost of product sales	$ 0	0	$ 400	0
Other accounts receivable	2,100		2,100		900
Powder Springs Logistics, LLC [Member] | Equity Method Investee [Member] | Product [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 0	0	$ 4,900	0
Saddlehorn Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	40.00%		40.00%
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Other accounts receivable	$ 200		$ 200		100
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 500	500	$ 1,600	1,600
Seabrook Logistics, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Seabrook Logistics, LLC [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Operating	$ 4,000	$ 0	$ 4,000	$ 0
Other accounts receivable					$ 200
Accounts Payable, Other, Current	$ 2,100		$ 2,100
Texas Frontera Llc [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%