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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Apr. 03, 2021
Accounting Policies [Abstract]  
Schedule of Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that total the amounts shown in the consolidated statements of cash flows (in thousands):
 April 3,
2021		December 31,
2020
Cash and cash equivalents$666,717 $674,255 
Restricted cash(1)
6,223 6,223 
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows$672,940 $680,478 
(1)Restricted cash primarily relates to escrow balances held for an outstanding earn-out agreement and working capital and other indemnification agreements.
Schedule of Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that total the amounts shown in the consolidated statements of cash flows (in thousands):
 April 3,
2021		December 31,
2020
Cash and cash equivalents$666,717 $674,255 
Restricted cash(1)
6,223 6,223 
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows$672,940 $680,478 
(1)Restricted cash primarily relates to escrow balances held for an outstanding earn-out agreement and working capital and other indemnification agreements.
Rollforward of Reserve for Uncollectible Accounts
The following table represents the rollforward of the allowance for credit losses for the periods indicated (in thousands):
Three Months Ended
April 3,
2021		April 4,
2020
Ending balance, prior period$13,313 $9,962 
Cumulative effect of accounting change(1)
— 678 
Provision for expected credit losses676 725 
Amounts charged against allowance for credit losses, net of recoveries438 (354)
Allowance for credit losses of acquired company at date of acquisition— 810 
Ending balance$14,427 $11,821 
(1)Cumulative effect of accounting change reflects the modified retrospective effect of adopting ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.
Disaggregation of Revenue by Segment The following table presents disaggregated revenue disclosure details of net sales by segment (in thousands):
Three Months Ended
April 3,
2021		April 4,
2020
Windows Net Sales Disaggregation:
Vinyl windows$497,017 $419,022 
Aluminum windows20,280 19,476 
Other9,966 9,952 
Total$527,263 $448,450 
Siding Net Sales Disaggregation:
Vinyl siding$150,229 $109,548 
Metal71,093 52,666 
Injection molded17,609 13,239 
Stone19,831 18,810 
Other products & services(1)
57,629 46,780 
Total$316,391 $241,043 
Commercial Net Sales Disaggregation:
Metal building products$299,938 $292,436 
Insulated metal panels85,603 99,229 
Metal coil coating37,837 32,653 
Total$423,378 $424,318 
Total Net Sales:$1,267,032 $1,113,811 
(1)Other products & services primarily consist of installation of stone veneer products.