Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 567,232	$ 661,609
Direct Financing Lease, Revenue	3,882	4,329
U.S. Liquids [Member]
Revenues	473,468	522,945
Direct Financing Lease, Revenue	3,882	4,329
U.S. Gas [Member]
Revenues	48,937	52,256
Canada [Member]
Revenues	44,827	45,145
Corporate, Non-Segment [Member]
Revenues	0	41,263
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	(4,289)	(3,640)
Revenues	(4,289)	(3,640)
Intersegment Eliminations [Member] | U.S. Gas [Member]
Revenues	4,289	3,640
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	420,233	510,768
Product [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	385,030	443,397
Product [Member] | U.S. Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	39,492	39,709
Product [Member] | Corporate, Non-Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	31,319
Pipeline transportation [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	21,121	20,339
Truck Transportation Revenue [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	3,942	5,728
Storage Services [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	41,744	38,121
Storage Services [Member] | Corporate, Non-Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	7,103
Facility Service Fees [Member] | U.S. Liquids [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	17,749	11,031
Service Fees [Member] | U.S. Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	13,667	16,187
Service Fees [Member] | Canada [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	31,476	30,542
Service Fees [Member] | Corporate, Non-Segment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	2,841
Other revenue [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	13,436	14,617
Other revenue [Member] | U.S. Gas [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	67	0
Other revenue [Member] | Canada [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 13,351	$ 14,603