Revenue from Contracts with Customers - Revenue From Contracts With Customers Table (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 510,728		$ 1,437,621
Total revenues and other	507,762	$ 574,695	1,432,483	$ 1,616,338
Service Revenues - Fee Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	409,106		1,146,099
Total revenues and other	409,106		1,146,099
Service Revenues - Product Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	22,735		67,433
Total revenues and other	22,735		67,433
Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	78,887		224,089
Total revenues and other	75,150		217,738
Commodity Price Swap Agreement [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	(3,737)		(6,351)
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	$ 771		$ 1,213