Summary of Significant Accounting Policies | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Use of Estimates We prepare our consolidated financial statements in accordance with accounting principles generally accepted in the United States of America, or U.S. GAAP. Our preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. We regularly evaluate these estimates utilizing historical experience, consultation with experts and other methods we consider reasonable in the circumstances. Nevertheless, actual results may differ from these estimates. We record the effect of any revisions to these estimates in our consolidated financial statements in the period in which the facts that give rise to the revision become known. Significant estimates we make include the estimated lives of depreciable property and equipment, recoverability of long-lived assets, the allowance for doubtful accounts and the amounts of deferred revenue and related prepaid pipeline fees. We denote amounts denominated in Canadian dollars that are disclosed within these consolidated financial statements with "C$" immediately prior to the stated amount. Change in Reporting Entity Prior to the completion of our IPO on October 15, 2014, our financial position, results of operations and cash flows consisted of the Predecessor, which represented a combined reporting entity. Subsequent to the IPO, our financial position, results of operations and cash flows consist of our consolidated activities and balances. The assets and liabilities in our consolidated financial statements have been reflected on a historical cost basis, as prior to the IPO all of the assets and liabilities presented were wholly-owned by USDG and its affiliates and were transferred within the USDG consolidated group. The consolidated statements of operations for periods prior to the IPO included expense allocations for certain corporate functions historically provided by USDG, including, but not limited to, general corporate expenses related to finance, legal, information technology, human resources, communications, insurance, utilities and executive compensation. Those allocations were based primarily on direct usage when identifiable, budgeted volumes or projected revenues, the remainder was allocated evenly across the number of operating entities. The consolidated statements of operations for periods prior to the IPO include amounts allocated to the Predecessor for general corporate expenses incurred by USDG within "Selling, general and administrative ." Management considers the basis on which the expenses have been allocated to reasonably reflect the utilization of services provided to or for the benefit received by the Predecessor during the periods presented prior to the IPO. The allocations may not, however, reflect the expenses the Predecessor would have incurred as an independent company for the periods presented prior to the IPO. Actual costs that may have been incurred if the Predecessor had been a standalone entity would depend on a number of factors, including the organizational structure, whether functions were outsourced or performed by employees and strategic decisions made in areas such as information technology and infrastructure. The Predecessor is unable to determine what such costs would have been had the Predecessor been independent prior to the IPO. Effective with the IPO, our general partner and its affiliates provide services to us pursuant to an omnibus agreement and a service agreement between the parties. The allocations and related estimates and assumptions are described more fully in Note 12 — Transactions with Related Parties . Principles of Consolidation The consolidated financial statements include our accounts and those of our wholly-owned subsidiaries on a consolidated basis. All significant intercompany accounts and transactions have been eliminated in consolidation. We consolidate the accounts of entities over which we have a controlling financial interest through our ownership of the general partner or the majority voting interests of the entity. Comparative Amounts We have made certain reclassifications to the amounts reported in the prior year financial statements to conform with our current year presentation. None of these reclassifications have an impact on our operating results, cash flows or financial position. Subsequent to filing our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2015, we determined that the "Note receivable — related party" balance in the amount of $2.5 million at December 31, 2014, was incorrectly presented in our consolidated balance sheets and in the consolidated statements of partners’ capital. Prior to the consummation of our IPO, the "Note receivable — related party" balance, representing C$2.9 million , was distributed to USDG by our Predecessor, thereby reducing the initial equity allocated to USDG as owner of all our subordinated units and a portion of our common units and the initial equity allocated to USD Partners GP LLC as owner of the general partner units. Our correction of this item resulted in the revision to the balances presented in our consolidated balance sheets and our consolidated statements of partners’ capital as of December 31, 2014. We have concluded that this correction is immaterial to all prior consolidated financial statements. This error did not affect our cash flows, net income or earnings per unit for any periods. Additionally, we elected to early adopt the provisions of Accounting Standards Update No. 2015-03 — Interest— imputation of interest , which simplified the presentation of debt issuance costs. Pursuant to the guidance of the new standard, we have presented debt issuance costs as a reduction of the carrying amount of the related indebtedness, rather than as an asset. Our adoption of this pronouncement did not have a material impact on our consolidated financial statements. However, the total assets and total liabilities as of December 31, 2014, as previously presented in our consolidated balance sheets were reduced by the reclassified amount of deferred financing costs, net. Our adjustments for the items described above resulted in revision to the balances presented in our consolidated balance sheets and our consolidated statements of partners’ capital as of December 31, 2014, as follows: As presented As adjusted As further adjusted December 31, 2014 Correcting Adjustment December 31, 2014 Adopting Adjustment December 31, 2014 (in thousands) Note receivable — related party $ 2,472 $ (2,472 ) $ — $ — $ — Total current assets $ 63,936 $ (2,472 ) $ 61,464 $ — $ 61,464 Deferred financing costs, net $ 2,900 $ — $ 2,900 $ (2,900 ) $ — Total assets $ 153,652 $ (2,472 ) $ 151,180 $ (2,900 ) $ 148,280 Long-term debt $ 81,358 $ — $ 81,358 $ (2,900 ) $ 78,458 Total liabilities $ 112,985 $ — $ 112,985 $ (2,900 ) $ 110,085 Partners' capital Common units $ 128,097 $ (232 ) $ 127,865 $ — $ 127,865 Subordinated units $ (87,978 ) $ (2,236 ) $ (90,214 ) $ — $ (90,214 ) General partner units $ 103 $ (91 ) $ 12 $ — $ 12 Accumulated other comprehensive income $ (105 ) $ 87 $ (18 ) $ — $ (18 ) Total partners' capital $ 40,667 $ (2,472 ) $ 38,195 $ — $ 38,195 Total liabilities and partners' capital $ 153,652 $ (2,472 ) $ 151,180 $ (2,900 ) $ 148,280 Foreign Currency A substantial portion of our operations are conducted in Canada and are accounted for in the local currency, the Canadian dollar, which we translate into our reporting currency, the U.S. dollar. We translate most Canadian dollar denominated balance sheet accounts at the end of period exchange rate, while most income statement accounts are translated monthly based on the average exchange rate for each monthly period. Amounts translated from foreign currencies into our U.S. dollar reporting currency can vary between periods due to fluctuations in the exchange rates between the foreign currency and the U.S. dollar. Revenue Recognition We derive our revenues from railcar loading and unloading services for bulk liquid products, including crude oil, biofuels, and related products, as well as sourcing railcar fleets and related logistics and maintenance services. We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been performed, the buyer’s price is fixed or determinable and collectability is reasonably assured. In accordance with the applicable accounting guidance, we record revenues for fleet leases on a gross basis, since we are deemed the primary obligor for the services. We also recognize as revenue on our consolidated statements of operations in "Freight and other reimbursables," on a gross basis, the amounts we charge to our customers for the out-of-pocket expenses we have incurred to provide our railcar fleet services. We recognize revenue for terminalling services we provide based upon the contractual rates set forth in our agreements related to throughput volumes. Substantially all of the capacity at our Casper and Hardisty terminals is contracted under multi-year agreements that contain “take-or-pay” provisions where we are entitled to payment from our customer of a minimum monthly commitment fee, regardless of whether the specified throughput to which the customer committed is achieved. These agreements grant the customers make-up rights that allow them to load volumes in excess of their minimum monthly commitment in future periods, without additional charge, to the extent capacity is available for the excess volume. With respect to the Casper terminal, the make-up rights generally expire within the three-month period, representing a calendar quarter, for which the volumes were originally committed. With respect to the Hardisty terminal, the make-up rights typically expire, if unused, in subsequent periods up to six months following the period for which the volumes were originally committed. We defer recognition of the revenue associated with volumes that are below the minimum monthly commitments until the earlier of (1) the period in which the throughput is utilized, (2) the customer’s ability to make up the minimum volume has expired in accordance with the terms of the agreements, or (3) we determine that the likelihood that the customer will be able to make up the minimum volume is remote. We recognize revenue for fleet leases and related party administrative services ratably over the contract period. Revenue for reimbursable costs is recognized as the costs are incurred. We have deferred revenues for amounts collected in advance from customers in our Fleet services segment, which will be recognized as revenue as the underlying services are performed pursuant to the terms of our contracts. We have prepaid rent associated with these deferred revenues on our railcar leases, which we will recognize as expense as these railcars are used. On December 13, 2013, USD Terminals Canada ULC, or USDTC, entered into a binding agreement with a major railway transportation company, which we refer to as the "Railway," effective with the commencement of the Hardisty terminal in June 2014, whereby in consideration for the Railway being the sole rail freight transportation service provider at the Hardisty terminal for certain customers, the Railway agreed to pay USDTC an average incentive payment amount of C $100 per railcar shipped up to a maximum of C $12.5 million through mid-2017. We recognize these revenues in "Railroad incentives" in our consolidated statements of operations as railcars utilize the services of the Railway pursuant to the terms of the agreement. Income Taxes We are not a taxable entity for United States federal income tax purposes, or for a majority of the states that impose an income tax. Taxes on our net income are generally borne by our unitholders through the allocation of taxable income, except for USD Rail LP, which, on October 7, 2014, elected to be classified as an entity taxable as a corporation. Our income tax expense is predominantly attributable to Canadian Federal and Provincial income taxes imposed on our operations based in Canada. Additionally, we are subject to state income tax laws that apply to entities organized as partnerships by the State of Texas. This state income tax is computed on our modified gross margin, which we have determined to be an income tax as set forth in the authoritative accounting guidance. Our current and historical provision for income taxes also reflects income taxes associated with USD Rail LP. We recognize deferred income tax assets and liabilities for temporary differences between the relevant basis of our assets and liabilities for financial reporting and tax purposes. We record the impact of changes in tax legislation on deferred income tax assets and liabilities in the period the legislation is enacted. Pursuant to the authoritative accounting guidance regarding uncertain tax positions, we recognize the tax effects of any uncertain tax position as the largest amount that will more likely than not be realized upon ultimate settlement with the taxing authority having full knowledge of the position and all relevant facts. Under this criterion, we evaluate the most likely resolution of an uncertain tax position based on its technical merits and on the outcome that we expect would likely be sustained under examination. Our policy is to recognize any interest or penalties related to the underpayment of income taxes as a component of income tax expense or benefit. We have not historically incurred any interest or penalties for the underpayment of income taxes. Net income for financial statement purposes may differ significantly from taxable income of unitholders as a result of differences between the tax basis and financial reporting basis of assets and liabilities and the taxable income allocation requirements under our partnership agreement. The aggregate difference in the basis of our net assets for financial and tax reporting purposes cannot be readily determined because information regarding each partner’s tax attributes in us is not available. Cash and Cash Equivalents Cash and cash equivalents consist of all unrestricted demand deposits and funds invested in highly liquid instruments with original maturities of three months or less. We periodically assess the financial condition of the financial institutions where these funds are held and believe that our credit risk is minimal. Accounts Receivable Accounts receivable consist of billed and unbilled amounts due from our customers, which include crude oil producing and petroleum refining companies, as well as marketers of petroleum, petroleum products and biofuels, for services we have provided. We perform ongoing credit evaluations of our customers. When appropriate, we use the specific identification method to estimate allowances for doubtful accounts based on our customers’ financial condition and collection history, as well as other pertinent factors. Accounts are written-off against the allowance for doubtful accounts when significantly past due and we have deemed the amounts uncollectible. Capitalization Policies and Depreciation Methods We record property and equipment at its original cost, which we depreciate on a straight-line basis over the estimated useful lives of the assets, which range from five to 20 years . Our determination of the useful lives of property and equipment requires us to make various assumptions when the assets are acquired or placed into service about the expected usage, normal wear and tear and the extent and frequency of maintenance programs. Expenditures for repairs and maintenance are charged to expense as incurred, while improvements that extend the service life or capacity of existing property and equipment are capitalized. Upon the sale or retirement of an asset, the related costs and accumulated depreciation are removed from the accounts and any gain or loss is recognized in our operating results. During construction we capitalize direct costs, such as labor, materials and overhead, as well as interest cost we may incur on indebtedness at our incremental borrowing rate. Asset Retirement Obligations We record a liability for the fair value of asset retirement obligations and conditional asset retirement obligations that we can reasonably estimate. We collectively refer to asset retirement obligations and conditional asset retirement obligations as ARO. Typically, we record an ARO at the time an asset is constructed or acquired, if a reasonable estimate of fair value can be made. In connection with establishing an ARO, we capitalize the expected costs as part of the carrying value of the related assets. We recognize any ongoing expense for the accretion component of the liability resulting from changes in value of the ARO due to the passage of time as part of accretion expense. We depreciate the initial capitalized cost over the useful lives of the related assets. We extinguish the liabilities for an ARO when assets are taken out of service or otherwise abandoned. Legal obligations exist for our SART and WCRT facilities due to terms within our lease agreements with the lessor that require us to remove our facilities at final abandonment. We generally own the land on which our Casper and Hardisty terminals and related facilities reside and as a result, similar legal obligations generally do not exist that would require us to remove our Casper and Hardisty facilities at final abandonment. Sufficient data exists to estimate the cost of abandoning or retiring our SART and WCRT facilities. However, insufficient information exists to reasonably determine the timing and/or method of settlement for estimating the fair value of the ARO. In these cases, the asset retirement obligation cost is considered indeterminate because there is no data or information that can be derived from past practice, industry practice, our intentions or the estimated economic life of the asset. Useful lives of our terminal facilities are primarily derived from available supply resources and ultimate consumption of those resources by end users. Many variables can affect the remaining lives of the assets, which preclude us from making a reasonable estimate of the ARO. We will recognize the fair value of an ARO for each of these facilities in the period in which sufficient information exists that will allow us to reasonably estimate potential settlement dates and methods. We do not have any ARO liabilities recorded at December 31, 2015 and 2014 . Impairment of Long-lived Assets We evaluate our long-lived assets for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. We consider a long-lived asset to be impaired when the sum of the estimated, undiscounted future cash flows from the use of the asset and its eventual disposition is less than the carrying amount of the asset. Factors that indicate potential impairment include economic obsolescence, the business climate, legal matters, a significant decrease in operating income or cash flows associated with the use of the asset and a significant change in the asset’s physical condition or use. Our estimates of future undiscounted cash flows take into account possible outcomes and probabilities of their occurrence when alternative courses of action to recover the carrying amount of a long-lived asset are under consideration. We recognize an impairment loss to the extent the carrying value exceeds the estimated fair value of the long-lived asset following our determination that the carrying amount of a long-lived asset is not recoverable based on the estimated future undiscounted cash flows. We determined there were no asset impairment indicators for the years ended December 31, 2015 , 2014 and 2013 . Intangible assets Our intangible assets primarily consist of customer contracts. We amortize these assets on a straight-line basis over the weighted average useful lives of the underlying assets, representing the period over which the assets are expected to contribute directly or indirectly to our future cash flows. Goodwill Goodwill represents the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. We test goodwill for impairment annually based on carrying values of our reporting units at the end of the second quarter, or more frequently if impairment indicators arise that suggest the carrying value of goodwill may be impaired. In testing goodwill for impairment, we make critical assumptions that include, but are not limited to, assessments of market conditions, projected cash flows, discount rates and growth rates. Impairment occurs when the carrying amount of a reporting unit’s goodwill exceeds its implied fair value. We reduce the carrying value of goodwill to its fair value at the time we determine that an impairment has occurred. We had no impairment of goodwill for the year ended December 31, 2015 . Fair Value Measurements We apply the authoritative accounting provisions for measuring fair value to our financial instruments and related disclosures, which include cash and cash equivalents, accounts receivable, accounts payable, debt, and derivative instruments. We define fair value as an exit price representing the expected amount we would receive to sell an asset or pay to transfer a liability in an orderly transaction with market participants at the measurement date. We employ a hierarchy which prioritizes the inputs we use to measure recurring fair value into three distinct categories based upon whether such inputs are observable in active markets or unobservable. We classify assets and liabilities in their entirety based on the lowest level of input that is significant to the fair value measurement. Our methodology for categorizing assets and liabilities that are measured at fair value pursuant to this hierarchy gives the highest priority to unadjusted quoted prices in active markets and the lowest level to unobservable inputs, summarized as follows: • Level 1 — Quoted prices in active markets for identical assets or liabilities. • Level 2 — Other significant observable inputs (including quoted prices in active markets for similar assets or liabilities). • Level 3 — Significant unobservable inputs (including our own assumptions in determining fair value). We use the cost, income or market valuation approaches to estimate the fair value of our assets and liabilities when insufficient market-observable data is available to support our valuation assumptions. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, and the long-term debt represented by our $400 million senior secured credit facility as presented on our consolidated balance sheets approximate fair value due to the short-term nature of these items and with respect to the credit facility, the frequent re-pricing of the underlying obligations. The fair value of our historical accounts receivable with affiliates and payables with affiliates cannot be determined due to the related party nature of these items. Derivative Financial Instruments Our net income and cash flows are subject to volatility stemming from changes in interest rates on our variable rate debt obligations and fluctuations in foreign currency exchange rates. We do not currently employ any derivative financial instruments to manage our exposure to fluctuations in interest rates, although we intend to use derivative financial instruments, including swaps, options and other financial instruments with similar characteristics to manage this exposure in the future. In order to manage our exposure to fluctuations in foreign currency exchange rates and the related risks to our unitholders, we use derivative financial instruments to offset these risks. We have a program that primarily utilizes foreign currency collar derivative contracts, representing written call options and purchased put options, to reduce the risks associated with the effects of foreign currency exposures related to our Canadian subsidiaries which have cash flows denominated in Canadian dollars. Under this program, our strategy is to have gains or losses on the derivative contracts mitigate the foreign currency transaction gains or losses to the extent practical. Economically, the collars help us to limit our exposure such that the exchange rate will effectively lie between the floor and the ceiling of the rates set forth in the derivative contacts. All of our derivative financial instruments are employed in connection with an underlying asset, liability and/or forecast transaction and are not entered into for speculative purposes. In accordance with the authoritative accounting guidance, we record all derivative financial instruments in our consolidated balance sheets at fair value as current or noncurrent assets or liabilities on a net basis by counterparty. We do not designate, nor have we historically designated, any of our derivative financial instruments as hedges of an underlying asset, liability and/or forecast transaction. To qualify for hedge accounting treatment as set forth in the authoritative accounting guidance, very specific requirements must be met in terms of hedge structure, hedge objective and hedge documentation. As a result, changes in the fair value of our derivative financial instruments and the related cash settlement of matured contracts are recognized in "Gain associated with derivative instruments" on our consolidated statements of operations. Refer to Note 18 — Derivative Financial Instruments Recent Accounting Pronouncements Not Yet Adopted The JOBS Act provides that an emerging growth company can delay adopting new or revised accounting standards until such time as those standards apply to private companies. We have irrevocably elected to “opt out” of this exemption and, therefore, will be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies. Leases In February 2016, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2016-02, which amends the FASB Accounting Standards Codification, or ASC, Topic 842 and requires balance sheet recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases. The amendment provides for the election of an option for leases with a term of 12 months or less, not to recognize the lease assets and liabilities. The pronouncement is effective for years beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the impact the adoption of this guidance will have on our financial position, results of operations and cash flows. Balance Sheet Classification of Deferred Taxes In November 2015, the FASB issued Accounting Standards Update No. 2015-17, which amends the FASB Accounting Standards Codification section 740 and requires that instead of distinct classification of current and noncurrent deferred tax assets and liabilities, all deferred tax assets and liabilities are required to be classified as noncurrent. In addition, for a particular tax-paying component of an entity and within a particular tax jurisdiction, all deferred tax liabilities and assets, as well as any related valuation allowance, are required to be offset and presented as a single noncurrent amount. This pronouncement is effective for fiscal years beginning after December 15, 2016, and may be applied prospectively to all deferred tax liabilities and assets or retrospectively to all periods presented, with early adoption permitted. We expect to adopt the provisions of this statement beginning the first quarter of 2016 and do not expect our adoption of this standard to have a material impact on our consolidated financial statements. Measurement-Period Adjustments In September 2015, the FASB issued Accounting Standards Update No. 2015-16, which amends the FASB Accounting Standards Codification section 805 and eliminates the requirement to retrospectively account for adjustments to the provisional amounts recognized for an acquisition and the corresponding adjustment to Goodwill. The standard requires such adjustments for provisional amounts to be recorded prospectively in the period the adjustment is identified. The pronouncement is effective for adjustments for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. We expect to adopt the provisions of this statement beginning the first quarter of 2016 and accordingly, will make any measurement adjustments prospectively. We do not expect our adoption of the standard to have a material impact on our consolidated financial statements. EPU Calculations for MLPs In April 2015, the FASB issued Accounting Standards Update No. 2015-06, which amends the FASB Accounting Standards Codification section 260 as it relates to the application of the two-class method of computing earnings per share by master limited partnerships. The guidance specifically requires that earnings or losses of a transferred business prior to the date of a dropdown transaction be allocated entirely to the general partner in computing earnings per unit and provide qualitative disclosures about how the rights to the earnings or losses before and after the dropdown differ for purposes of computing earnings per unit. This pronouncement is effective for fiscal years beginning after December 15, 2015, and should be applied retrospectively for all financial statements presented, with early adoption permitted. We do not expect our adoption of this standard to have a material impact on our consolidated financial statements. Consolidation In February 2015, the FASB issued Accounting Standards Update No. 2015-02, which changes the consolidation analysis for all reporting entities, but primarily affects the consolidation of limited partnerships and their equivalents. All reporting entities that hold a variable interest in other legal entities will be required to reassess their consolidation conclusions and potentially revise their disclosures. This pronouncement is effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted. We do not expect our adoption of this standard to have a material impact on our consolidated financial statements. Revenue from Contracts with Customers In May 2014, the FASB issued Accounting Standards Update No. 2014-09 that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In July 2015, the FASB delayed the effective date of the new revenue standard by one year. This accounting update is effective for annual and interim periods beginning on or after December 15, 2017 and may be applied on either a full or modified retrospective basis. We are currently evaluating which transition approach we will apply and the impact that this pronouncement will have on our consolidated financial statements. |