Revenue from Contracts with Customers - Revenue From Contracts With Customers Table (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from customers	$ 437,098		$ 875,290
Total revenues and other	435,949	$ 525,450	873,117	$ 1,041,643
Service Revenues - Fee Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	359,544		697,963
Total revenues and other	359,544		697,963
Service Revenues - Product Based [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	22,105		44,698
Total revenues and other	22,105		44,698
Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from customers	55,449		132,629
Total revenues and other	54,077		130,014
Commodity Price Swap Agreement [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	(1,372)		(2,615)
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from other than customers	$ 223		$ 442