Commitments and Contingencies	12 Months Ended
Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. COMMITMENTS AND CONTINGENCIES Legal and Environmental Matters The Company accrues expenses for contingencies when it is probable that an asset has been impaired or a liability has been incurred and management can reasonably estimate the expense. Contingencies for which the Company has made accruals include environmental and other legal matters. It is possible, however, that actual expenses could exceed our accrual by a material amount which could have a material adverse effect on the Company’s future liquidity, financial condition or operating results in the period in which any such additional expenses are incurred or recognized. Environmental Matters The Company was previously identified as a potentially responsible party in connection with the cleanup of contamination at a formerly owned property in Montana. On February 18, 2015, the Montana Department of Environmental Quality (the “DEQ”) issued an amendment to the unilateral administrative order of the DEQ outlining the final remediation of the property in its Record of Decision (the “ROD”). In September 2015, the remedial action work plan (“RAWP”) was approved. The Company paid $0.4 million, $0.6 million and $4.6 million in 2019, 2018 and 2017, respectively, for costs related to implementation of the RAWP. While the Company expects ongoing remediation expenditures to continue, it is unable to ascertain the timeline for completion given the uncertain nature of projects of this type. Following subsequent reviews of the remaining costs to complete the remediation, the Company recorded a charge of $0.5 million in the fourth quarter of 2018 which was reflected in discontinued operations. The Company estimates the total remaining cost of implementing the RAWP to be $2.9 million at December 31, 2019 and this amount is accrued in “other accrued liabilities” and “other non-current liabilities” on the condensed balance sheets. The Company believes the accrual represents a reasonable best estimate of the total remaining remediation costs, based on facts, circumstances, and information currently available. However, there are currently unknown variables relating to the actual levels of contaminants and amounts of soil that will ultimately require treatment or removal and as part of the remediation process, additional soil and groundwater sampling, and bench and pilot testing is required to ensure the remediation will achieve the outcome required by the DEQ. The ultimate final amount of remediation costs and expenditures are difficult to estimate with certainty and as a result, the amount of actual costs and expenses ultimately incurred by the Company with respect to this property could be lower than, or exceed the amount accrued as of December 31, 2019 by a material amount. If actual costs are materially higher, the incremental expenses over the amount currently accrued could have a material adverse effect on our liquidity, financial condition and operating results. In addition, some of the Company’s current and former distribution centers are located in areas where environmental contamination may have occurred, and for which the Company, among others, could be held responsible. The Company currently believes that there are no material environmental liabilities at any of its distribution center locations. Legal Matters On June 29, 2018, the Company entered into a confidential agreement with PrimeSource Building Products, Inc. for settlement and release of all claims between the parties. The agreement does not limit or restrict the future business activities of any of the parties and did not have a material adverse effect on the Company’s financial condition, results of operations, nor cash flows. The Company incurred approximately $3.5 million and $3.1 million in expenses related to the Primesource litigation and settlement for the years ended December 31, 2018 and 2017, respectively. The Company is also party to various other litigation matters, in most cases involving ordinary and routine claims incidental to its business. It cannot reasonably estimate the ultimate legal and financial liability with respect to all pending litigation matters. However, the Company believes, based on our examination of such matters, that the ultimate liability will not have a material adverse effect on its financial position, results of operation or cash flows.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

10. COMMITMENTS AND CONTINGENCIES

Legal and Environmental Matters

The Company accrues expenses for contingencies when it is probable that an asset has been impaired or a liability has been incurred and management can reasonably estimate the expense. Contingencies for which the Company has made accruals include environmental and other legal matters. It is possible, however, that actual expenses could exceed our accrual by a material amount which could have a material adverse effect on the Company’s future liquidity, financial condition or operating results in the period in which any such additional expenses are incurred or recognized.

Environmental Matters

The Company was previously identified as a potentially responsible party in connection with the cleanup of contamination at a formerly owned property in Montana. On February 18, 2015, the Montana Department of Environmental Quality (the “DEQ”) issued an amendment to the unilateral administrative order of the DEQ outlining the final remediation of the property in its Record of Decision (the “ROD”). In September 2015, the remedial action work plan (“RAWP”) was approved.

The Company paid $0.4 million, $0.6 million and $4.6 million in 2019, 2018 and 2017, respectively, for costs related to implementation of the RAWP. While the Company expects ongoing remediation expenditures to continue, it is unable to ascertain the timeline for completion given the uncertain nature of projects of this type. Following subsequent reviews of the remaining costs to complete the remediation, the Company recorded a charge of $0.5 million in the fourth quarter of 2018 which was reflected in discontinued operations. The Company estimates the total remaining cost of implementing the RAWP to be $2.9 million at December 31, 2019 and this amount is accrued in “other accrued liabilities” and “other non-current liabilities” on the condensed balance sheets. The Company believes the accrual represents a reasonable best estimate of the total remaining remediation costs, based on facts, circumstances, and information currently available. However, there are currently unknown variables relating to the actual levels of contaminants and amounts of soil that will ultimately require treatment or removal and as part of the remediation process, additional soil and groundwater sampling, and bench and pilot testing is required to ensure the remediation will achieve the outcome required by the DEQ. The ultimate final amount of remediation costs and expenditures are difficult to estimate with certainty and as a result, the amount of actual costs and expenses ultimately incurred by the Company with respect to this property could be lower than, or exceed the amount accrued as of December 31, 2019 by a material amount. If actual costs are materially higher, the incremental expenses over the amount currently accrued could have a material adverse effect on our liquidity, financial condition and operating results.

In addition, some of the Company’s current and former distribution centers are located in areas where environmental contamination may have occurred, and for which the Company, among others, could be held responsible. The Company currently believes that there are no material environmental liabilities at any of its distribution center locations.

Legal Matters

On June 29, 2018, the Company entered into a confidential agreement with PrimeSource Building Products, Inc. for settlement and release of all claims between the parties. The agreement does not limit or restrict the future business activities of any of the parties and did not have a material adverse effect on the Company’s financial condition, results of operations, nor cash flows. The Company incurred approximately $3.5 million and $3.1 million in expenses related to the Primesource litigation and settlement for the years ended December 31, 2018 and 2017, respectively.

The Company is also party to various other litigation matters, in most cases involving ordinary and routine claims incidental to its business. It cannot reasonably estimate the ultimate legal and financial liability with respect to all pending litigation matters. However, the Company believes, based on our examination of such matters, that the ultimate liability will not have a material adverse effect on its financial position, results of operation or cash flows.