Components of Working Capital - Other Current Assets Table (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
NGLs inventory		$ 504	$ 1,203
Materials and supplies inventory		25,151	9,665
Imbalance receivables		4,118	9,035
Prepaid insurance		8,087	1,972
Contract assets		5,130	5,399
Other		0	4,184
Total other current assets	[1]	42,990	31,458	[2]
WES Operating [Member]
NGLs inventory		504	1,203
Materials and supplies inventory		25,151	9,665
Imbalance receivables		4,118	9,035
Prepaid insurance		5,237	1,972
Contract assets		5,130	5,399
Other		0	3,309
Total other current assets	[3]	$ 40,140	$ 30,583	[2]

[1] Other current assets includes affiliate amounts of $0.8 million and $3.7 million as of September 30, 2019, and December 31, 2018, respectively.

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

[3] Other current assets includes affiliate amounts of $0.8 million and $3.7 million as of September 30, 2019, and December 31, 2018, respectively.