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FAIR VALUE MEASUREMENT - Fair Value Measurement (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 25, 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 | $ 56,857 | $ 99,306 | $ 107,752 | $ 135,631
Restricted investments classified as held-to-maturity | 111,171 | 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 | 28,834 | 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 | 69,537 | 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 | 11,843 | 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 | 957 | 962 |  |
Fair value, recurring | Total fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 26,400 | 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 | 30,457 | 37,421 |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 56,857 | 99,306 |  |
Restricted investments classified as held-to-maturity | 111,171 | 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 | 28,834 | 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 | 69,537 | 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 | 11,843 | 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 | 957 | 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 | 26,400 | 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 | 30,457 | 37,421 |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 56,857 | 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 | 111,171 | 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 | 28,834 | 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 | 69,537 | 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 | 11,843 | 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 | 957 | 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 |  |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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