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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 25, 2023 | Jun. 30, 2024 | Jun. 25, 2023 | Dec. 31, 2023
Restricted Cash and Investments [Line Items] |  |  |  |  |
Cash collateral held by insurance carriers | $ 23,896 |  | $ 23,896 |  | $ 23,598
Cash and cash equivalents held in Trust | 5,816 |  | 5,816 |  | 12,703
Investments held in Trust | 113,268 |  | 113,268 |  | 122,659
Company owned life insurance policies | 39,627 |  | 39,627 |  | 32,905
Other restricted cash and cash equivalents | 745 |  | 745 |  | 1,120
Restricted cash and investments | 183,352 |  | 183,352 |  | 192,985
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 113,268 |  | 113,268 |  | 122,659
Gross unrealized gains | 124 |  | 124 |  | 533
Gross unrealized losses | (2,221) |  | (2,221) |  | (2,279)
Fair value | 111,171 |  | 111,171 |  | 120,913
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 113,268 |  | 113,268 |  | 122,659
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 111,171 |  | 111,171 |  | 120,913
Unrealized gains (losses) on Investments | 303 | $ 1,558 | 2,722 | $ 1,975 |
Municipal debt securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 29,150 |  | 29,150 |  | 32,042
Gross unrealized gains | 0 |  | 0 |  | 4
Gross unrealized losses | (316) |  | (316) |  | (242)
Fair value | 28,834 |  | 28,834 |  | 31,804
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 29,150 |  | 29,150 |  | 32,042
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 28,834 |  | 28,834 |  | 31,804
Corporate debt securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 71,296 |  | 71,296 |  | 76,578
Gross unrealized gains | 71 |  | 71 |  | 333
Gross unrealized losses | (1,830) |  | (1,830) |  | (1,999)
Fair value | 69,537 |  | 69,537 |  | 74,912
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 71,296 |  | 71,296 |  | 76,578
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 69,537 |  | 69,537 |  | 74,912
Agency mortgage-backed securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 11,823 |  | 11,823 |  | 13,039
Gross unrealized gains | 53 |  | 53 |  | 196
Gross unrealized losses | (33) |  | (33) |  | 0
Fair value | 11,843 |  | 11,843 |  | 13,235
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 11,823 |  | 11,823 |  | 13,039
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 11,843 |  | 11,843 |  | 13,235
U.S. government and agency securities |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 999 |  | 999 |  | 1,000
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | (42) |  | (42) |  | (38)
Fair value | 957 |  | 957 |  | 962
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 999 |  | 999 |  | 1,000
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Fair value | 957 |  | 957 |  | $ 962
Restricted cash and investments |  |  |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |  |
Amortized cost of held-to-maturity investments | 113,268 |  | 113,268 |  |
Fair value | 111,171 |  | 111,171 |  |
Held-to-maturity securities, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | 26,153 |  | 26,153 |  |
Due after one year through five years | 74,731 |  | 74,731 |  |
Due after five years through ten years | 6,207 |  | 6,207 |  |
Due after ten years | 6,177 |  | 6,177 |  |
Amortized cost of held-to-maturity investments | 113,268 |  | 113,268 |  |
Held-to-maturity securities, fair value [Abstract] |  |  |  |  |
Due in one year or less | 25,810 |  | 25,810 |  |
Due after one year through five years | 73,005 |  | 73,005 |  |
Due after five years through ten years | 6,145 |  | 6,145 |  |
Due after ten years | 6,211 |  | 6,211 |  |
Fair value | $ 111,171 |  | $ 111,171 |  |

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