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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jan. 01, 2017
--- | --- | --- | --- | ---
Fair Value Measurement [Line Items] |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 87,441 | $ 73,831 | $ 94,845 | $ 103,222
Deferred compensation mutual funds | 25,410 | 22,428 |  |
Restricted investments classified as held-to-maturity | 160,238 | 172,238 |  |
Municipal debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 76,234 | 83,366 |  |
Corporate debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 80,194 | 83,791 |  |
Agency mortgage-backed securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 2,846 | 4,062 |  |
U.S. government and agency securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 964 | 1,019 |  |
Total Fair Value |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | 34,736 | 28,780 |  |
Total Fair Value | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | 52,705 | 45,051 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 87,441 | 73,831 |  |
Deferred compensation mutual funds | 25,410 | 22,428 |  |
Restricted investments classified as held-to-maturity | 160,238 | 172,238 |  |
Total Fair Value | Restricted Assets | Municipal debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 76,234 | 83,366 |  |
Total Fair Value | Restricted Assets | Corporate debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 80,194 | 83,791 |  |
Total Fair Value | Restricted Assets | Agency mortgage-backed securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 2,846 | 4,062 |  |
Total Fair Value | Restricted Assets | U.S. government and agency securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 964 | 1,019 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | 34,736 | 28,780 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | 52,705 | 45,051 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 87,441 | 73,831 |  |
Deferred compensation mutual funds | 25,410 | 22,428 |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | Municipal debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | Corporate debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | Agency mortgage-backed securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets | U.S. government and agency securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Significant Other Observable Inputs (Level 2) | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | 0 | 0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 |  |
Deferred compensation mutual funds | 0 | 0 |  |
Restricted investments classified as held-to-maturity | 160,238 | 172,238 |  |
Significant Other Observable Inputs (Level 2) | Restricted Assets | Municipal debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 76,234 | 83,366 |  |
Significant Other Observable Inputs (Level 2) | Restricted Assets | Corporate debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 80,194 | 83,791 |  |
Significant Other Observable Inputs (Level 2) | Restricted Assets | Agency mortgage-backed securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 2,846 | 4,062 |  |
Significant Other Observable Inputs (Level 2) | Restricted Assets | U.S. government and agency securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 964 | 1,019 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Restricted Assets |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted cash and cash equivalents | 0 | 0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 |  |
Deferred compensation mutual funds | 0 | 0 |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Restricted Assets | Municipal debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Restricted Assets | Corporate debt securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Restricted Assets | Agency mortgage-backed securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Restricted Assets | U.S. government and agency securities |  |  |  |
Fair Value Measurement [Line Items] |  |  |  |
Restricted investments classified as held-to-maturity | $ 0 | $ 0 |  |

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