Business and Basis of Presentation (Policies)	6 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted Accounting Standards In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases,” which amends accounting for leases, most notably by requiring a lessee to recognize the assets and liabilities that arise from a lease agreement. Specifically, this new guidance requires lessees to recognize a liability to make lease payments and a right-of-use (“ROU”) asset representing its right to use the underlying asset for the lease term, with limited exceptions. In January 2018, FASB issued ASU 2018-01, “Land Easement Practical Expedient for Transition to Topic 842,” which permits an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist at transition or expired before the adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. In July 2018, FASB issued ASU 2018-10, “Codification improvements to Topic 842, Leases,” which affects narrow aspects of the guidance issued in the amendments in Update 2016-02. In July 2018, FASB also issued ASU 2018-11, “Targeted Improvements,” which allows companies to adopt ASC Topic 842 without revising comparative period reporting or disclosures and provides an optional practical expedient for lessors to not separate lease and non-lease components of a contract when certain criteria are met. Effective January 1, 2019, we adopted these standards using the modified retrospective transition method and have applied all practical expedients related to leases existing at the date of initial application. Upon adoption, the most significant change was to the Condensed Consolidated Balance Sheet related to the recognition of new ROU assets and lease liabilities on a continuing operations basis. Upon adoption we recognized ROU assets and lease liabilities of $29.2 million, based on the present value of the future minimum rental payments for existing operating leases. We have no leases that classify as financing arrangements. As required by the lease ASC updates, we have expanded our disclosure of leases. See Note 10 for additional information. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” which amends the financial reporting of hedging relationships in order to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the guidance simplifies the application of current hedge accounting guidance. Effective January 1, 2019, we adopted the guidance, which had no material impact on our financial condition, results of operations or cash flows. In June 2018, the FASB issued ASU 2018-07, “Improvements to Nonemployee Share-Based Payment Accounting,” which simplifies the aspects of accounting for nonemployee share-based payment transactions resulting from expanding the scope of ASC Topic 718, Compensation – Stock Compensation, to include share-based payment transactions for acquiring goods and services from non-employees. Effective January 1, 2019, we adopted this standard using the modified retrospective transition method. Our adoption of this standard had no material impact on our financial condition, results of operations or cash flows. Recently Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, "Measurement of Credit Losses on Financial Instruments," which requires immediate recognition of estimated credit losses that are expected to occur over the remaining life of many financial assets. This new guidance is effective for annual and interim periods in fiscal years beginning after December 15, 2019. We are currently evaluating the impact the adoption of this standard will have on our financial condition, results of operations and cash flows. In August 2018, the FASB issued ASU 2018-14, “Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans,” which amends ASC 715-20, Compensation – Retirement Benefits – Defined Benefit Plans. The ASU modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The disclosure requirements to be removed include the amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit costs over the next fiscal year, the amount and timing of plan assets expected to be returned to the employer and the effect of a one percentage point change in assumed health care cost trend rates on the aggregate service cost and benefit obligation for postretirement health care benefits. The new disclosure requirements include the interest crediting rates for cash balance plans, and an explanation of significant gains and losses related to changes in benefit obligations. This guidance is effective for fiscal years ending after December 15, 2020. We are currently evaluating the impact the adoption of this standard will have on our disclosures. In August 2018, the FASB issued ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract,” which amends ASC 350-40 Intangibles – Goodwill and Other – Internal-Use Software. The ASU requires implementation costs incurred by customers in cloud computing arrangements to be deferred and recognized over the term of the arrangement, if these costs were capitalized by the customer in a software licensing arrangement. This guidance is effective for fiscal years beginning after December 15, 2019. We are currently evaluating the impact the adoption of this standard will have on our financial condition, results of operations and cash flows.
Revenue Recognition	Revenue Recognition We recognize revenue upon transfer of control of our products to the customer, which typically occurs upon shipment. Our main performance obligation to our customers is the delivery of products in accordance with purchase orders. Each purchase order defines the transaction price for the products purchased under the arrangement. Direct sales to building materials distributors, home centers, direct customers, and retailers represent the majority of our sales. Our standard sales terms are Free On Board (“FOB”) shipping point. We have some sales terms that are FOB destination. At the point of shipment, the customer is required to pay under normal sales terms. Our normal payment terms in most cases are 45 days or less and our sales arrangements do not have any material financing components. In addition, our customer arrangements do not produce contract assets or liabilities that are material to our consolidated financial statements. Within our Architectural Specialties segment, the majority of revenues are customer project driven, which includes a minority of revenues derived from the sale of customer specified customized products that have no alternative use to us. The manufacturing cycle for these custom products is short. Incremental costs to fulfill our customer arrangements are expensed as incurred, as the amortization period is less than one year. Our products are sold with normal and customary return provisions. We provide limited warranties for defects in materials or factory workmanship, sagging and warping, and certain other manufacturing defects. Warranties are not sold separately to customers. Our product warranties place certain requirements on the purchaser, including installation and maintenance in accordance with our written instructions. In addition to our warranty program, under certain limited circumstances, we will occasionally and at our sole discretion, provide a customer accommodation repair or replacement. Warranty repairs and replacements are most commonly made by professional installers employed by or affiliated with our independent distributors. Reimbursement for costs associated with warranty repairs are provided to our independent distributors through a credit against accounts receivable from the distributor to us. Sales returns and warranty claims have historically not been material and do not constitute separate performance obligations. We often enter into agreements with our customers to offer incentive programs, primarily volume rebates and promotions. The majority of our rebates are designated as a percentage of annual customer purchases. We estimate the amount of rebate based on actual sales for the period and accrue for the projected incentive programs costs. We record the costs of the rebate accruals as a reduction to our revenue. In addition, other sales discounts, including early pay promotions, are deducted immediately from the sales invoice.
Shipping and Handling	Shipping and Handling We account for product shipping and handling costs as fulfillment activities and present the associated costs in costs of goods sold in the period in which we sell our product.

Business and Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2019

Recently Adopted and Recently Issued Accounting Standards

Recently Adopted Accounting Standards

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases,” which amends accounting for leases, most notably by requiring a lessee to recognize the assets and liabilities that arise from a lease agreement. Specifically, this new guidance requires lessees to recognize a liability to make lease payments and a right-of-use (“ROU”) asset representing its right to use the underlying asset for the lease term, with limited exceptions.

In January 2018, FASB issued ASU 2018-01, “Land Easement Practical Expedient for Transition to Topic 842,” which permits an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist at transition or expired before the adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. In July 2018, FASB issued ASU 2018-10, “Codification improvements to Topic 842, Leases,” which affects narrow aspects of the guidance issued in the amendments in Update 2016-02. In July 2018, FASB also issued ASU 2018-11, “Targeted Improvements,” which allows companies to adopt ASC Topic 842 without revising comparative period reporting or disclosures and provides an optional practical expedient for lessors to not separate lease and non-lease components of a contract when certain criteria are met.

Effective January 1, 2019, we adopted these standards using the modified retrospective transition method and have applied all practical expedients related to leases existing at the date of initial application. Upon adoption, the most significant change was to the Condensed Consolidated Balance Sheet related to the recognition of new ROU assets and lease liabilities on a continuing operations basis. Upon adoption we recognized ROU assets and lease liabilities of $29.2 million, based on the present value of the future minimum rental payments for existing operating leases. We have no leases that classify as financing arrangements. As required by the lease ASC updates, we have expanded our disclosure of leases. See Note 10 for additional information.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities,” which amends the financial reporting of hedging relationships in order to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the guidance simplifies the application of current hedge accounting guidance. Effective January 1, 2019, we adopted the guidance, which had no material impact on our financial condition, results of operations or cash flows.

In June 2018, the FASB issued ASU 2018-07, “Improvements to Nonemployee Share-Based Payment Accounting,” which simplifies the aspects of accounting for nonemployee share-based payment transactions resulting from expanding the scope of ASC Topic 718, Compensation – Stock Compensation, to include share-based payment transactions for acquiring goods and services from non-employees. Effective January 1, 2019, we adopted this standard using the modified retrospective transition method. Our adoption of this standard had no material impact on our financial condition, results of operations or cash flows.

Recently Issued Accounting Standards

In June 2016, the FASB issued ASU 2016-13, "Measurement of Credit Losses on Financial Instruments," which requires immediate recognition of estimated credit losses that are expected to occur over the remaining life of many financial assets. This new guidance is effective for annual and interim periods in fiscal years beginning after December 15, 2019. We are currently evaluating the impact the adoption of this standard will have on our financial condition, results of operations and cash flows.

In August 2018, the FASB issued ASU 2018-14, “Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans,” which amends ASC 715-20, Compensation – Retirement Benefits – Defined Benefit Plans. The ASU modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The disclosure requirements to be removed include the amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit costs over the next fiscal year, the amount and timing of plan assets expected to be returned to the employer and the effect of a one percentage point change in assumed health care cost trend rates on the aggregate service cost and benefit obligation for postretirement health care benefits. The new disclosure requirements include the interest crediting rates for cash balance plans, and an explanation of significant gains and losses related to changes in benefit obligations. This guidance is effective for fiscal years ending after December 15, 2020. We are currently evaluating the impact the adoption of this standard will have on our disclosures.

In August 2018, the FASB issued ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract,” which amends ASC 350-40 Intangibles – Goodwill and Other – Internal-Use Software. The ASU requires implementation costs incurred by customers in cloud computing arrangements to be deferred and recognized over the term of the arrangement, if these costs were capitalized by the customer in a software licensing arrangement. This guidance is effective for fiscal years beginning after December 15, 2019. We are currently evaluating the impact the adoption of this standard will have on our financial condition, results of operations and cash flows.

Revenue Recognition

We recognize revenue upon transfer of control of our products to the customer, which typically occurs upon shipment. Our main performance obligation to our customers is the delivery of products in accordance with purchase orders. Each purchase order defines the transaction price for the products purchased under the arrangement. Direct sales to building materials distributors, home centers, direct customers, and retailers represent the majority of our sales. Our standard sales terms are Free On Board (“FOB”) shipping point. We have some sales terms that are FOB destination. At the point of shipment, the customer is required to pay under normal sales terms. Our normal payment terms in most cases are 45 days or less and our sales arrangements do not have any material financing components. In addition, our customer arrangements do not produce contract assets or liabilities that are material to our consolidated financial statements. Within our Architectural Specialties segment, the majority of revenues are customer project driven, which includes a minority of revenues derived from the sale of customer specified customized products that have no alternative use to us. The manufacturing cycle for these custom products is short.

Incremental costs to fulfill our customer arrangements are expensed as incurred, as the amortization period is less than one year.

Our products are sold with normal and customary return provisions. We provide limited warranties for defects in materials or factory workmanship, sagging and warping, and certain other manufacturing defects. Warranties are not sold separately to customers. Our product warranties place certain requirements on the purchaser, including installation and maintenance in accordance with our written instructions. In addition to our warranty program, under certain limited circumstances, we will occasionally and at our sole discretion, provide a customer accommodation repair or replacement. Warranty repairs and replacements are most commonly made by professional installers employed by or affiliated with our independent distributors. Reimbursement for costs associated with warranty repairs are provided to our independent distributors through a credit against accounts receivable from the distributor to us. Sales returns and warranty claims have historically not been material and do not constitute separate performance obligations.

We often enter into agreements with our customers to offer incentive programs, primarily volume rebates and promotions. The majority of our rebates are designated as a percentage of annual customer purchases. We estimate the amount of rebate based on actual sales for the period and accrue for the projected incentive programs costs. We record the costs of the rebate accruals as a reduction to our revenue. In addition, other sales discounts, including early pay promotions, are deducted immediately from the sales invoice.

Shipping and Handling

We account for product shipping and handling costs as fulfillment activities and present the associated costs in costs of goods sold in the period in which we sell our product.