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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]    
Other long-term liabilities related to asset retirement obligation $ 25,800 $ 18,400
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning balance 18,413 19,032
Accretion 1,531 1,214
Additions and revisions of prior estimates 5,881 (319)
Addition related to EPMH acquisition 0 2,733
EPMH measurement period adjustment 0 (2,131)
Disposal related to sale of transloads 0 (2,116)
Ending balance $ 25,825 $ 18,413