Components of Working Capital - Accrued Liabilities Table (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Accrued interest expense		$ 72,064	$ 70,968
Short-term asset retirement obligations		22,472	25,938
Short-term remediation and reclamation obligations		3,528	863
Income taxes payable		697	384
Contract liabilities		19,659	16,235
Other		31,373	14,760
Total accrued liabilities	[1]	149,793	129,148
WES Operating [Member]
Accrued interest expense		72,064	70,959
Short-term asset retirement obligations		22,472	25,938
Short-term remediation and reclamation obligations		3,528	863
Income taxes payable		697	384
Contract liabilities		19,659	16,235
Other		31,219	13,495
Total accrued liabilities	[2]	$ 149,639	$ 127,874

[1] Accrued liabilities includes affiliate amounts of $3.1 million and $2.2 million as of December 31, 2019 and 2018, respectively.

[2] Accrued liabilities includes affiliate amounts of $3.1 million and $2.2 million as of December 31, 2019 and 2018, respectively.