Investments in Non-Controlled Entities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Productive Assets			$ 334,583	$ 65,574
Gain (Loss) on Disposition of Other Assets	$ 0	$ 2,532	12,887	28,966
Revenues	598,264	656,596	1,841,478	1,987,230
Operating	161,982	169,387	457,597	484,341
Other operating income (expense)	(2,863)	(379)	539	1,538
Trade accounts receivable	109,051		109,051			$ 125,440
Other accounts receivable	27,735		27,735			23,887
Change in Equity Method Investments [Roll Forward]
Investments, Beginning Balance			1,240,551
Additional investment			73,678
Sale of ownership interest in Saddlehorn			(66,989)
Proportionate share of earnings			117,848
Amortization of excess investment and capitalized interest			(1,364)
Earnings of non-controlled entities	39,135	50,189	116,484	122,229
Distributions from operations of non-controlled entities			152,645	138,140
Investments, Ending Balance	1,211,079		1,211,079
Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	473,531	506,432	1,343,741	1,473,629
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	$ 700	1,200	$ 2,900	3,800
BridgeTex [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	30.00%		30.00%
BridgeTex [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Trade accounts receivable	$ 382		$ 382			392
Other accounts receivable	441		441			26
Other Accounts Payable	225		225
BridgeTex [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 9,323	10,737	$ 32,748	31,063
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	$ 286		$ 286			445
Double Eagle Pipeline Llc [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 995	1,582	$ 4,016	4,813
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]
Trade accounts receivable						60
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 operating income (expense)	$ 0	289	$ 0	289
Other accounts receivable	$ 460		$ 460			418
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]
Trade accounts receivable						161
Long-term receivables	$ 8,970		$ 8,970			6,006
Saddlehorn Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	30.00%		30.00%		30.00%
Equity Method Investment Sold Percentage					10.00%
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Other accounts receivable	$ 142		$ 142			126
Saddlehorn Pipeline Company [Member] | Equity Method Investee [Member] | Service [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 580	566	$ 1,711	1,669
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	$ 7,175	6,267	$ 21,553	19,417
Other operating income (expense)	0	$ 0	1,410	$ 0
Trade accounts receivable	497		497			941
Other Accounts Payable	$ 4,267		$ 4,267			$ 1,349
Texas Frontera Llc [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Investment in Saddlehorn JV [Member] | Saddlehorn Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of Productive Assets			$ 79,900
Gain (Loss) on Disposition of Other Assets			$ (12,900)