FAIR VALUE MEASUREMENT - Fair Value Measurement (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 26, 2023 | Dec. 25, 2022 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Cash, cash equivalents, restricted cash and restricted cash equivalents | $ 71,720 | $ 99,306 | $ 109,590 | $ 135,631 |
Restricted investments classified as held-to-maturity | 114,899 | 120,913 | | |
Municipal debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 28,981 | 31,804 | | |
Corporate debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 72,439 | 74,912 | | |
Agency mortgage-backed securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 12,523 | 13,235 | | |
U.S. government and agency securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 956 | 962 | | |
Fair value, recurring | Total fair value | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Cash and cash equivalents | 36,184 | 61,885 | | |
Fair value, recurring | Total fair value | Restricted assets | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted cash and cash equivalents | 35,536 | 37,421 | | |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 71,720 | 99,306 | | |
Restricted investments classified as held-to-maturity | 114,899 | 120,913 | | |
Fair value, recurring | Total fair value | Restricted assets | Municipal debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 28,981 | 31,804 | | |
Fair value, recurring | Total fair value | Restricted assets | Corporate debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 72,439 | 74,912 | | |
Fair value, recurring | Total fair value | Restricted assets | Agency mortgage-backed securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 12,523 | 13,235 | | |
Fair value, recurring | Total fair value | Restricted assets | U.S. government and agency securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 956 | 962 | | |
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Cash and cash equivalents | 36,184 | 61,885 | | |
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted cash and cash equivalents | 35,536 | 37,421 | | |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 71,720 | 99,306 | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | Municipal debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | Corporate debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | Agency mortgage-backed securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | U.S. government and agency securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Significant other observable inputs (level 2) | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted cash and cash equivalents | 0 | 0 | | |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 0 | 0 | | |
Restricted investments classified as held-to-maturity | 114,899 | 120,913 | | |
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | Municipal debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 28,981 | 31,804 | | |
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | Corporate debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 72,439 | 74,912 | | |
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | Agency mortgage-backed securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 12,523 | 13,235 | | |
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | U.S. government and agency securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 956 | 962 | | |
Fair value, recurring | Significant unobservable inputs (level 3) | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Cash and cash equivalents | 0 | 0 | | |
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted cash and cash equivalents | 0 | 0 | | |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 0 | 0 | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | Municipal debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | Corporate debt securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | Agency mortgage-backed securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | 0 | 0 | | |
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | U.S. government and agency securities | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments classified as held-to-maturity | $ 0 | $ 0 | | |