Environmental	3 Months Ended
Mar. 31, 2018
Accrual for Environmental Loss Contingencies [Abstract]
Environmental	Environmental We incurred no expenses for the three months ended March 31, 2018 and 2017 for environmental remediation obligations. The accrued environmental liability, net of expected recoveries from indemnifying parties, reflected in our consolidated balance sheets was $6.4 million and $6.5 million at March 31, 2018 and December 31, 2017, respectively, of which $4.9 million and $5.0 million, respectively, were classified as other long-term liabilities. These accruals include remediation and monitoring costs expected to be incurred over an extended period of time. Under the Omnibus Agreement and certain transportation agreements and purchase agreements with HFC, HFC has agreed to indemnify us, subject to certain monetary and time limitations, for environmental noncompliance and remediation liabilities associated with certain assets transferred to us from HFC and occurring or existing prior to the date of such transfers. As of March 31, 2018 and December 31, 2017, our consolidated balance sheets included additional accrued environmental liabilities of $0.7 million and $0.8 million, respectively, for HFC indemnified liabilities, and other assets included equal and offsetting balances representing amounts due from HFC related to indemnifications for environmental remediation liabilities.

Environmental

We incurred no expenses for the three months ended March 31, 2018 and 2017 for environmental remediation obligations. The accrued environmental liability, net of expected recoveries from indemnifying parties, reflected in our consolidated balance sheets was $6.4 million and $6.5 million at March 31, 2018 and December 31, 2017, respectively, of which $4.9 million and $5.0 million, respectively, were classified as other long-term liabilities. These accruals include remediation and monitoring costs expected to be incurred over an extended period of time.

Under the Omnibus Agreement and certain transportation agreements and purchase agreements with HFC, HFC has agreed to indemnify us, subject to certain monetary and time limitations, for environmental noncompliance and remediation liabilities associated with certain assets transferred to us from HFC and occurring or existing prior to the date of such transfers. As of March 31, 2018 and December 31, 2017, our consolidated balance sheets included additional accrued environmental liabilities of $0.7 million and $0.8 million, respectively, for HFC indemnified liabilities, and other assets included equal and offsetting balances representing amounts due from HFC related to indemnifications for environmental remediation liabilities.