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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2018 | Sep. 26, 2018 | Jun. 27, 2018 | Mar. 28, 2018 | Dec. 27, 2017 | Sep. 27, 2017 | Jun. 28, 2017 | Mar. 29, 2017 | Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ 52,720 | $ 39,003 | $ 30,556
TOTAL EXPENSES |  |  |  |  |  |  |  |  | 427,599 | 324,997 | 240,670
OPERATING INCOME | $ 2,836 | $ 9,343 | $ 13,018 | $ 6,514 | $ 5,838 | $ 10,610 | $ 11,737 | $ 5,628 | 31,711 | 33,813 | 27,805
Other income |  |  |  |  |  |  |  |  | 78 | 127,221 | 688
Interest expense |  |  |  |  |  |  |  |  | (2,415) | (1,643) | (374)
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 30,810 | 160,293 | 28,496
Income tax expense |  |  |  |  |  |  |  |  | 8,862 | 151,409 | 6,350
NET INCOME | $ (548) | $ 6,946 | $ 10,571 | $ 4,979 | $ (11,032) | $ 7,870 | $ 8,184 | $ 3,682 | 21,948 | 8,884 | 22,146
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany revenue |  |  |  |  |  |  |  |  | 2,055 | 1,466 | 1,603
Revenues |  |  |  |  |  |  |  |  | 2,055 | 1,466 | 1,603
General and administrative expenses |  |  |  |  |  |  |  |  | 1,933 | 1,692 | 1,603
TOTAL EXPENSES |  |  |  |  |  |  |  |  | 1,933 | 1,692 | 1,603
OPERATING INCOME |  |  |  |  |  |  |  |  | 122 | (226) | 0
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 21,537 | 22,090 | 16,982
Other income |  |  |  |  |  |  |  |  | 78 | 127,221 | 688
Interest expense |  |  |  |  |  |  |  |  | (14) | (50) | (16)
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 21,723 | 149,035 | 17,654
Income tax expense |  |  |  |  |  |  |  |  | 6,544 | 149,355 | 5,208
NET INCOME |  |  |  |  |  |  |  |  | $ 15,179 | $ (320) | $ 12,446

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