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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 23, 2020
Fair Value Disclosures [Abstract] |
Schedule of Cash and Cash Equivalents | The following tables summarize our cash, cash equivalents and marketable securities by significant investment categories as of September 23, 2020 and December 25, 2019:
|  | September 23, 2020
| Cost Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Marketable Securities
Cash | $ | 174,883 |  |  | $ | — |  |  | $ | — |  |  | $ | 174,883 |  |  | $ | 174,883 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
| Money market funds | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Mutual funds | 16,829 |  |  | 50 |  |  | — |  |  | 16,879 |  |  | — |  |  | 16,879 |
Total | $ | 191,712 |  |  | $ | 50 |  |  | $ | — |  |  | $ | 191,762 |  |  | $ | 174,883 |  |  | $ | 16,879 |
|  | December 25, 2019
| Cost Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Marketable Securities
Cash | $ | 32,094 |  |  | $ | — |  |  | $ | — |  |  | $ | 32,094 |  |  | $ | 32,094 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |
| Money market funds | 5,005 |  |  | — |  |  | — |  |  | 5,005 |  |  | 5,005 |  |  | — |
| Mutual funds | 36,436 |  |  | 72 |  |  | — |  |  | 36,508 |  |  | — |  |  | 36,508 |
Total | $ | 73,535 |  |  | $ | 72 |  |  | $ | — |  |  | $ | 73,607 |  |  | $ | 37,099 |  |  | $ | 36,508 |
Schedule of Other Income From Available for Sale Securities | A summary of other income (loss) from equity securities recognized during the thirteen and thirty-nine weeks ended September 23, 2020 and September 25, 2019 is as follows:
|  | Thirteen Weeks Ended |  | Thirty-Nine Weeks Ended |  |
| September 23 2020 |  | September 25 2019 |  | September 23 2020 |  | September 25 2019 |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |
| Dividend income | $ | 40 |  |  | $ | 254 |  |  | $ | 290 |  |  | $ | 997 |  |  |  |  |
| Realized gain (loss) on sale of investments | — |  |  | — |  |  | 79 |  |  | 22 |  |  |  |  |
| Unrealized gain (loss) on equity securities | — |  |  | — |  |  | (22) |  |  | 231 |  |  |  |  |
Total | $ | 40 |  |  | $ | 254 |  |  | $ | 347 |  |  | $ | 1,250 |  |  |  |  |
Schedule of Available-for-sale Securities and Gross Realized Gains and Losses | A summary of equity securities sold and gross realized gains and losses recognized during the thirteen and thirty-nine weeks ended September 23, 2020 and September 25, 2019 is as follows:
|  | Thirteen Weeks Ended |  | Thirty-Nine Weeks Ended
| September 23 2020 |  | September 25 2019 |  | September 23 2020 |  | September 25 2019
Equity securities: |  |  |  |  |  |  |
| Gross proceeds from sales and redemptions | $ | — |  |  | $ | — |  |  | $ | 20,000 |  |  | $ | 27,000 |
| Cost basis of sales and redemptions | — |  |  | — |  |  | 19,921 |  |  | 26,978 |
| Gross realized gains included in net income (loss) | — |  |  | — |  |  | 79 |  |  | 36 |
| Gross realized losses included in net income (loss) | — |  |  | — |  |  | — |  |  | (14) |

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