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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Dec. 28, 2018
Operating
2020	$ 6,418
2021	5,680
2022	4,891
2023	3,425
2024	2,498
2025 and thereafter	4,530
Total lease payments	27,442
Less: Imputed interest	(3,481)
Total lease obligations	23,961
Lease liability	5,550
Noncurrent lease obligations	18,411
Finance
2020	394
2021	178
2022	17
Total lease payments	589
Less: Imputed interest	(23)
Total lease obligations	566
Finance lease obligations	375	$ 320
Finance lease obligations, less current portion	$ 191	$ 224

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