Commitments and Contingencies	12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental Matters We are subject to federal, state, and local environmental laws and regulations. We routinely conduct reviews of potential environmental issues and claims that could impact our assets or operations. These reviews assist us in identifying environmental issues and estimating the costs and timing of remediation efforts. In making environmental liability estimations, we consider the material effect of environmental compliance, pending legal actions against us and potential third-party liability claims. Often, as the remediation evaluation and effort progresses, additional information is obtained, requiring revisions to estimated costs. These revisions are reflected in our income in the period in which they are probable and reasonably estimable. As of December 31, 2017 and 2016, we had $0.3 million and $6.8 million accrued liabilities associated with environmental clean-up costs. The accrued liability as of December 31, 2017 relates to a Consent Decree issued in 1998 by the State of Washington Department of Ecology with respect to our products terminal located in Seattle, Washington. The costs relate to ongoing groundwater compliance monitoring and other remedial activities. The accrued liability as of December 31, 2016 relates to the Consent Decree liability, as well as to certain liabilities associated with the terminals located in Portland, Oregon and Seattle, Washington associated with the Portland Harbor Superfund Site. Pursuant to the Contribution Agreement, dated December 1, 2017, by and between SOPUS and Triton, SOPUS agreed to retain certain liabilities associated with these costs. We do not anticipate any obligations, costs or expenses related to the Portland Superfund Site to arise after the closing date. Legal Proceedings We are named defendants in lawsuits and governmental proceedings that arise in the ordinary course of our business. For each of our outstanding legal matters, we evaluate the merits of the case, our exposure to the matter, possible legal or settlement strategies and the likelihood of an unfavorable outcome. While there are still uncertainties related to the ultimate costs we may incur, based upon our evaluation and experience to date, we do not expect that the ultimate resolution of these matters will have a material adverse effect on our financial position, operating results or cash flows. Effective July 31, 2014, a rate case was filed against Zydeco with FERC. The rate case was resolved by a settlement approved by FERC which established maximum rates for uncommitted (or non-contract) shippers effective December 1, 2015. The settlement also provided for rate refunds for shippers of the difference between the higher pre-settlement uncommitted (or non-contract) rates and the lower settlement rates for the period from July 31, 2014 to November 30, 2015 (plus interest). In 2015, we recognized $2.3 million of general and administrative expenses related to the settlement of this rate case, and the shippers settlements were paid in January 2016. We filed claims for reimbursement of $1.4 million in 2015 from SPLC, and we received reimbursement in 2016. Indemnification Under our Omnibus Agreement, certain environmental liabilities, tax liabilities, litigation and other matters attributable to the ownership or operation of our assets prior to the IPO are indemnified by SPLC. Other than tax liabilities for which the statute of limitations has not expired, the obligations of SPLC under the Omnibus Agreement have expired. See Note 4 –Related Party Transactions for additional information. Minimum Throughput On September 1, 2016, the in-service date of the capital lease for the Port Neches storage tanks, a joint tariff agreement with a third party became effective and requires monthly payments of approximately $0.4 million. The tariff will be analyzed annually and updated based on the FERC indexing adjustment to rates effective July 1 of each year. There was no FERC indexing adjustment to this rate effective July 1, 2017. The initial term of the agreement is ten years with automatic one year renewal terms with the option to cancel prior to each renewal period. Other Commitments We hold cancelable easements or rights-of-way arrangements from landowners permitting the use of land for the construction and operation of our pipeline systems. Obligations under these easements are not material to the results of our operations. Leases We have an operating lease for land, lease of platform space, tie-in agreement, and a capital lease for storage tanks. See Note 9 –Leases for additional information relating to our lease obligations.

Commitments and Contingencies

Environmental Matters

We are subject to federal, state, and local environmental laws and regulations. We routinely conduct reviews of potential environmental issues and claims that could impact our assets or operations. These reviews assist us in identifying environmental issues and estimating the costs and timing of remediation efforts. In making environmental liability estimations, we consider the material effect of environmental compliance, pending legal actions against us and potential third-party liability claims. Often, as the remediation evaluation and effort progresses, additional information is obtained, requiring revisions to estimated costs. These revisions are reflected in our income in the period in which they are probable and reasonably estimable. As of December 31, 2017 and 2016, we had $0.3 million and $6.8 million accrued liabilities associated with environmental clean-up costs. The accrued liability as of December 31, 2017 relates to a Consent Decree issued in 1998 by the State of Washington Department of Ecology with respect to our products terminal located in Seattle, Washington. The costs relate to ongoing groundwater compliance monitoring and other remedial activities. The accrued liability as of December 31, 2016 relates to the Consent Decree liability, as well as to certain liabilities associated with the terminals located in Portland, Oregon and Seattle, Washington associated with the Portland Harbor Superfund Site. Pursuant to the Contribution Agreement, dated December 1, 2017, by and between SOPUS and Triton, SOPUS agreed to retain certain liabilities associated with these costs. We do not anticipate any obligations, costs or expenses related to the Portland Superfund Site to arise after the closing date.

Legal Proceedings

We are named defendants in lawsuits and governmental proceedings that arise in the ordinary course of our business. For each of our outstanding legal matters, we evaluate the merits of the case, our exposure to the matter, possible legal or settlement strategies and the likelihood of an unfavorable outcome. While there are still uncertainties related to the ultimate costs we may incur, based upon our evaluation and experience to date, we do not expect that the ultimate resolution of these matters will have a material adverse effect on our financial position, operating results or cash flows.

Effective July 31, 2014, a rate case was filed against Zydeco with FERC. The rate case was resolved by a settlement approved by FERC which established maximum rates for uncommitted (or non-contract) shippers effective December 1, 2015. The settlement also provided for rate refunds for shippers of the difference between the higher pre-settlement uncommitted (or non-contract) rates and the lower settlement rates for the period from July 31, 2014 to November 30, 2015 (plus interest). In 2015, we recognized $2.3 million of general and administrative expenses related to the settlement of this rate case, and the shippers settlements were paid in January 2016. We filed claims for reimbursement of $1.4 million in 2015 from SPLC, and we received reimbursement in 2016.

Indemnification

Under our Omnibus Agreement, certain environmental liabilities, tax liabilities, litigation and other matters attributable to the ownership or operation of our assets prior to the IPO are indemnified by SPLC. Other than tax liabilities for which the statute of limitations has not expired, the obligations of SPLC under the Omnibus Agreement have expired. See Note 4 –Related Party Transactions for additional information.

Minimum Throughput

On September 1, 2016, the in-service date of the capital lease for the Port Neches storage tanks, a joint tariff agreement with a third party became effective and requires monthly payments of approximately $0.4 million. The tariff will be analyzed annually and updated based on the FERC indexing adjustment to rates effective July 1 of each year. There was no FERC indexing adjustment to this rate effective July 1, 2017. The initial term of the agreement is ten years with automatic one year renewal terms with the option to cancel prior to each renewal period.

Other Commitments

We hold cancelable easements or rights-of-way arrangements from landowners permitting the use of land for the construction and operation of our pipeline systems. Obligations under these easements are not material to the results of our operations.

Leases

We have an operating lease for land, lease of platform space, tie-in agreement, and a capital lease for storage tanks. See Note 9 –Leases for additional information relating to our lease obligations.