Commitments and Contingent Liabilities

Operating lease commitments

As of December 1, 2018, the Company was obligated under non-cancelable operating leases for buildings and equipment. Certain leases provide for increased rental payments based upon increases in real estate taxes or operating costs. Future minimum rental payments under non-cancelable operating leases are:



In thousands	Remainder of Fiscal 2019		Fiscal 2020		Fiscal 2021		Fiscal 2022		Fiscal 2023		Thereafter		Total
Total minimum payments	$	3,890	$	14,759	$	11,522	$	9,353	$	8,459	$	23,308	$	71,291

Bond commitments and installation project contingencies

In the ordinary course of business, predominantly in our Architectural Services and Architectural Framing Systems segments, we are required to provide surety or performance bonds that commit payments to our customers for any non-performance. At December 1, 2018, $224.0 million of our backlog was bonded by these types of bonds with a face value of $478.8 million. These bonds do not have stated expiration dates, as we are generally released from the bonds upon completion of the contract. We have not been required to make any payments under these bonds with respect to our existing businesses.

Additionally, we also are subject to project management and installation-related contingencies as a result of our fixed-price material supply and installation service contracts, primarily in our Architectural Services segment and certain of our Architectural Framing Systems businesses, including those taken on with our acquisition of EFCO. We actively manage the risk of these exposures through contract negotiations, proactive project management and insurance coverages.

Warranties

We reserve estimated exposures on known claims, as well as on a portion of anticipated claims, for product warranty and rework cost, based on historical product liability claims as a ratio of sales. Claim costs are deducted from the accrual when paid. Factors that could have an impact on the warranty accrual in any given period include the following: changes in manufacturing quality, changes in product mix and any significant changes in sales volume. A warranty rollforward follows:



	Nine Months Ended
In thousands	December 1, 2018			December 2, 2017
Balance at beginning of period	$	22,517		$	21,933
Additional accruals	3,437			3,443
Claims paid	(8,398		)	(8,254		)
Acquired reserves	—			5,571
Balance at end of period	$	17,556		$	22,693

Letters of credit

At December 1, 2018, we had $25.1 million of ongoing letters of credit, all of which have been issued under our committed revolving credit facility, as discussed in Note 7.

Purchase obligations

Purchase obligations for raw material commitments and capital expenditures totaled $163.2 million as of December 1, 2018.

New Markets Tax Credit transactions

In September 2018, we entered into a transaction with SunTrust Community Capital (STCC) under a qualified New Markets Tax Credit (NMTC) program related to an investment in plant and equipment within our Architectural Framing Systems segment. STCC contributed $3.2 million to this project, which is included in other non-current liabilities on our consolidated balance sheets. We have completed two NMTC transactions this fiscal year. Under the terms of these arrangements, we are required to hold cash dedicated to fund the related capital projects which is classified as restricted cash on our consolidated balance sheets.

Since fiscal 2014, we have entered into four separate NMTC programs to support our operational expansion. The NMTC arrangements are subject to 100 percent tax credit recapture for a period of seven years from the date of each respective transaction. Therefore, upon the termination of each arrangement at the end of the seven-year period, proceeds received from investors will be recognized in earnings in exchange for the transfer of tax credits. Direct and incremental costs incurred in structuring these arrangements have been deferred and will be recognized in conjunction with the recognition of the related profits.

Variable-interest entities have been created as a result of the transaction structure, which have been included within our consolidated financial statements as investors in the program do not have a material interest in the underlying economics of the respective projects.

Litigation

In November 2018, a purported class action lawsuit was filed claiming the Company and certain named executive officers made materially false and/or misleading statements and failed to disclose material adverse facts about the Company’s business and operations during the period June 28, 2018 to September 17, 2018. In December 2018, a derivative lawsuit was filed against certain of our executive officers and directors claiming breach of fiduciary duty, waste of corporate assets and unjust enrichment. We intend to vigorously defend against these matters. Due to the preliminary nature of these matters, we are unable to estimate any potential loss at this time.

In addition to the foregoing, the Company is a party to various legal proceedings incidental to its normal operating activities. In particular, like others in the construction supply and services industry, the Company is routinely involved in various disputes and claims arising out of construction projects, sometimes involving significant monetary damages or product replacement. The Company is also subject to litigation arising out of areas such as employment practices, workers compensation and general liability matters. Although it is very difficult to accurately predict the outcome of any such proceedings, facts currently available indicate that no matters will result in losses that would have a material adverse effect on the results of operations, cash flows or financial condition of the Company.