Revenue from Contracts with Customers - Revenue From Contracts With Customers Table (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 684,688	$ 519,210		$ 1,356,841	$ 1,021,274
Total revenues and other	685,054	518,078	[1]	1,356,937	1,019,132	[1]
Service Revenues - Fee Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	593,544	431,861		1,173,518	825,634
Service Revenues - Product Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	16,675	22,662		36,054	46,085
Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	74,469	64,687		147,269	149,555
Commodity Price Swap Agreement [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	0	(1,372)		(667)	(2,615)
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	$ 366	$ 240		$ 763	$ 473

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