Revenue from Contracts with Customers - Revenue From Contracts With Customers Table (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 672,153	$ 502,064
Total revenues and other	671,883	501,054	[1]
Service Revenues - Fee Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	579,974	393,773
Service Revenues - Product Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	19,379	23,423
Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	72,800	84,868
Commodity Price Swap Agreement [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	(667)	(1,243)
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	$ 397	$ 233

[1] Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.