Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 674,940	$ 595,794	$ 1,242,172	$ 1,257,403
Direct Financing Lease, Revenue	4,034	4,251	7,916	8,580
U.S. Liquids [Member]
Revenues	575,033	466,133	1,048,501	989,078
Direct Financing Lease, Revenue	4,034	4,251	7,916	8,580
U.S. Gas [Member]
Revenues	37,083	59,167	86,020	111,406
Canada [Member]
Revenues	62,824	69,631	107,651	114,776
Corporate, Non-Segment [Member]
Revenues	0	863	0	42,143
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	(3,983)	(3,205)	(8,272)	(6,845)
Revenues	(3,983)	(3,206)	(8,272)	(6,863)
Intersegment Eliminations [Member] | U.S. Gas [Member]
Revenues	3,983	3,206	8,272	6,863
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	517,002	423,290	937,235	934,058
Product [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	492,084	381,721	877,114	825,118
Product [Member] | U.S. Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	28,901	44,775	68,393	84,484
Product [Member] | Corporate, Non-Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	31,319
Pipeline transportation [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	21,236	21,602	42,357	41,941
Truck Transportation Revenue [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	3,175	7,046	7,117	12,774
Storage Services [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	41,113	38,812	82,857	76,933
Storage Services [Member] | Corporate, Non-Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	651	0	7,754
Facility Service Fees [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	13,391	12,701	31,140	23,732
Service Fees [Member] | U.S. Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	12,149	17,598	25,816	33,785
Service Fees [Member] | Canada [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	42,139	50,402	73,615	80,944
Service Fees [Member] | Corporate, Non-Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	211	0	3,052
Other revenue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	20,719	19,286	34,155	33,906
Other revenue [Member] | U.S. Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	16	0	83	0
Other revenue [Member] | Canada [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 20,685	$ 19,229	$ 34,036	$ 33,832