Revenue from Contract with Customers (Schedule of Prospective Adoption) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Item Effected [Line Items]
Transportation and terminals revenue	$ 472,248	$ 433,239	$ 904,185	$ 825,910
Depreciation and amortization	53,619	$ 48,896	105,498	$ 96,194
Property, Plant and Equipment, Gross	7,443,095		7,443,095			$ 7,235,468
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,783,036		1,783,036			1,682,633
Property, Plant and Equipment, Net	5,660,059		5,660,059			5,552,835
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	1,210,259		1,210,259			1,082,511
Deferred revenue	120,134		120,134			117,795
Other noncurrent liabilities	69,526		69,526			30,350
Limited partner unitholders	2,281,845		2,281,845			2,267,231
Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Transportation and terminals revenue	472,248		904,185
Depreciation and amortization	53,619		105,498
Property, Plant and Equipment, Gross	7,443,095		7,443,095		$ 7,243,984
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,783,036		1,783,036		1,682,958
Property, Plant and Equipment, Net	5,660,059		5,660,059		5,561,026
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	1,210,259		1,210,259		1,083,013
Deferred revenue	120,134		120,134		115,894
Other noncurrent liabilities	69,526		69,526		34,969
Limited partner unitholders	2,281,845		2,281,845		2,273,206
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Item Effected [Line Items]
Transportation and terminals revenue	465,079		896,603
Depreciation and amortization	53,555		105,378
Property, Plant and Equipment, Gross	7,433,091		7,433,091			7,235,468
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,782,591		1,782,591			1,682,633
Property, Plant and Equipment, Net	5,650,500		5,650,500			5,552,835
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	1,209,757		1,209,757			1,082,511
Deferred revenue	128,349		128,349			117,795
Other noncurrent liabilities	64,687		64,687			30,350
Limited partner unitholders	2,268,408		2,268,408			$ 2,267,231
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Item Effected [Line Items]
Transportation and terminals revenue	7,169		7,582
Depreciation and amortization	64		120
Property, Plant and Equipment, Gross	10,004		10,004		8,516
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	445		445		325
Property, Plant and Equipment, Net	9,559		9,559		8,191
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	502		502		502
Deferred revenue	(8,215)		(8,215)		(1,901)
Other noncurrent liabilities	4,839		4,839		4,619
Limited partner unitholders	$ 13,437		$ 13,437		$ 5,975