Revenue from Contracts with Customers - Revenue From Contracts With Customers Table (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018		Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 665,689	$ 590,401		$ 2,022,530	$ 1,611,674
Revenue from other than customers, other	338	1,236		1,101	1,709
Total revenues and other	666,027	587,900	[1]	2,022,964	1,607,032	[1]
Service Revenues - Fee Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	587,965	486,329		1,761,483	1,311,963
Service Revenues - Product Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	9,476	23,336		45,530	69,421
Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	68,248	80,736		215,517	230,290
Commodity Price Swap Agreement [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	$ 0	$ (3,737)		$ (667)	$ (6,351)

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