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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) | 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 Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ (548,000) | $ 6,946,000 | $ 10,571,000 | $ 4,979,000 | $ (11,032,000) | $ 7,870,000 | $ 8,184,000 | $ 3,682,000 | $ 21,948,000 | $ 8,884,000 | $ 22,146,000
Available-for-sale Securities: |  |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized holding (losses) | [1] |  |  |  |  |  |  |  |  | (3,000) | (94,000) | (35,000)
Less: reclassification adjustments for net realized losses included in net income | [1] |  |  |  |  |  |  |  |  | 16,000 | 47,000 | 19,000
OTHER COMPREHENSIVE LOSS, NET OF TAX |  |  |  |  |  |  |  |  |  | 13,000 | (47,000) | (16,000)
COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  | 21,961,000 | 8,837,000 | 22,130,000
Income tax benefit |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 15,179,000 | (320,000) | 12,446,000
Available-for-sale Securities: |  |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized holding (losses) | [1] |  |  |  |  |  |  |  |  | (3,000) | (67,000) | (22,000)
Less: reclassification adjustments for net realized losses included in net income | [1] |  |  |  |  |  |  |  |  | 13,000 | 33,000 | 12,000
OTHER COMPREHENSIVE LOSS, NET OF TAX | [1] |  |  |  |  |  |  |  |  | 10,000 | (34,000) | (10,000)
COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  | $ 15,189,000 | (354,000) | 12,436,000
Income tax benefit |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
[1] | Net of tax benefit of $0 for fiscal years ended December 26, 2018, December 27, 2017 and December 28, 2016.

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