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Summary of significant accounting policies (Policies)
 6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]  
Basis of Presentation The Company's condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and include the accounts and results of operations of the Company and its consolidated subsidiaries.
Consolidation All intercompany transactions have been eliminated in consolidation.
Reclassifications Certain prior year numbers were reclassified to conform with current year presentation. Such reclassification had no impact on the previously reported results of operations.
Use of Estimates
Use of estimates

The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities as of the reporting date, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. These estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future. The more significant estimates made by management relate to fair value estimates for assets and liabilities acquired in business combinations; estimates for accrued liabilities for environmental cleanup, bodily injury and insurance claims; estimates for commitments and contingencies; and estimates for the realizability of deferred tax assets, the tax receivable agreement obligation, inventory reserves, allowance for doubtful accounts and impairment of goodwill and long-lived assets.

Certain accounting matters that generally require consideration of forecasted financial information were assessed in light of the impact from the COVID-19 pandemic. The accounting matters assessed included, but were not limited to, the Company’s allowance for doubtful accounts, inventory reserves, goodwill impairment, impairment of property and equipment and valuation allowances for tax assets. While the assessments resulted in no material impacts to the Company’s condensed consolidated financial statements as of and for the three and six months ended June 30, 2020, the Company believes the full impact of the COVID-19 outbreak remains uncertain
and will continue to assess if ongoing developments related to the outbreak may cause future material impacts to its consolidated financial statements.
Credit Losses
Credit Losses

Trade accounts receivable. The allowance for doubtful accounts is based on the Company’s assessment of the collectability of customer accounts. The Company regularly reviews the allowance by considering factors such as historical experience, credit quality, the age of the accounts receivable balances, and current economic conditions that may affect a customer’s ability to pay.

The Company's exposure to credit losses may increase if one or more of its customers are adversely affected by changes in laws or other government recommendations or mandates, economic pressures or uncertainty associated with local or global economic recessions, disruption or other impacts associated with the coronavirus disease 2019 ("COVID-19") pandemic, or other customer-specific factors. Although the Company has historically not experienced significant credit losses, it is possible that there could be a material adverse impact from potential adjustments of the carrying amount of trade receivables as customers are impacted by the COVID-19 pandemic.
Recent Accounting Guidance Adopted and Not Yet Adopted
Recent Accounting Guidance Adopted

In June 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The standard replaces the incurred loss impairment methodology under current U.S. GAAP with a methodology that reflects expected credit losses and requires the use of a forward-looking expected credit loss model for accounts receivables, loans, and other financial instruments. The Company adopted this ASU on January 1, 2020 using a modified retrospective approach, which did not have a material impact on the Company's condensed consolidated financial statements.

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments in the ASU provide optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference London Interbank Offered Rate ("LIBOR") or another reference rate expected to be discontinued due to reference rate reform. The guidance was effective upon issuance and generally can be applied through December 31, 2022 and has not had any material impact to the Company's condensed consolidated financial statements.

Recent Accounting Guidance Not Yet Adopted

In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (Topic 740). The new guidance simplifies the accounting for income taxes by eliminating certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period, hybrid taxes, and the recognition of deferred tax liabilities for outside basis differences.  It also clarifies and simplifies other aspects of the accounting for income taxes.  For public companies, the amendments in this ASU are effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years.  Early adoption is permitted in interim or annual periods with any adjustments reflected as of the beginning of the annual period that includes that interim period.  Additionally, entities that elect early adoption must adopt all the
amendments in the same period.  Amendments are to be applied prospectively, except for certain amendments that are to be applied either retrospectively or with a modified retrospective approach through a cumulative effect adjustment recorded to retained earnings.  The effects of this standard on the Company's condensed consolidated financial statements are not expected to be material.