Components of Working Capital - Accrued Liabilities Table (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accrued interest expense	$ 72,309	$ 70,968
Short-term asset retirement obligations	24,564	25,938
Short-term remediation and reclamation obligations	863	863
Income taxes payable	1,319	384
Contract liabilities	6,620	16,235
Other	114,051	14,760
Total accrued liabilities	219,726	129,148	[1]
WES Operating [Member]
Accrued interest expense	72,309	70,959
Short-term asset retirement obligations	24,564	25,938
Short-term remediation and reclamation obligations	863	863
Income taxes payable	1,319	384
Contract liabilities	6,620	16,235
Other	113,518	13,495
Total accrued liabilities	$ 219,193	$ 127,874	[1]

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