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ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES (Tables) | 12 Months Ended
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Dec. 26, 2020
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Gross unrecognized tax benefits beginning of year | ​ | $ | 4,166 | ​ | $ | 4,378 | ​ | $ | 4,000
Increase in tax positions for prior years | ​ |  | (82) | ​ |  | (129) | ​ |  | (366)
Increase in tax positions for current year | ​ |  | 730 | ​ |  | 768 | ​ |  | 1,326
Lapse in statute of limitations | ​ |  | (922) | ​ |  | (851) | ​ |  | (582)
Gross unrecognized tax benefits end of year | ​ | $ | 3,892 | ​ | $ | 4,166 | ​ | $ | 4,378

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=121610041&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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