Components of Working Capital - Other Current Assets Table (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
NGLs inventory		$ 6,861	$ 6,466
Imbalance receivables		5,800	9,035
Prepaid insurance		1,064	1,972
Contract assets		7,172	5,399
Other		2,575	4,184
Total other current assets	[1]	23,472	27,056	[2]
WES Operating [Member]
NGLs inventory		6,861	6,466
Imbalance receivables		5,800	9,035
Prepaid insurance		1,026	1,972
Contract assets		7,172	5,399
Other		2,575	3,309
Total other current assets	[3]	$ 23,434	$ 26,181	[2]

[1] Other current assets includes affiliate amounts of $7.4 million and $3.7 million as of March 31, 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 $7.4 million and $3.7 million as of March 31, 2019, and December 31, 2018, respectively.