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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |
Cash collateral held by insurance carriers | $ 22,926 | $ 34,910
Cash and cash equivalents held in Trust | 16,113 | 32,841
Investments held in Trust | 171,752 | 146,517
Other | 28,440 | 16,925
Restricted cash and investments | 239,231 | 231,193
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 1,324 | 685
Gross Unrealized Loss | (838) | (1,249)
Fair Value | 172,238 | 145,953
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 172,238 | 145,953
Municipal debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 82,770 | 71,618
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 974 | 443
Gross Unrealized Loss | (378) | (865)
Fair Value | 83,366 | 71,196
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 83,366 | 71,196
Corporate debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 83,916 | 68,934
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 309 | 212
Gross Unrealized Loss | (434) | (352)
Fair Value | 83,791 | 68,794
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 83,791 | 68,794
Agency mortgage-backed securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 4,066 | 5,965
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 22 | 30
Gross Unrealized Loss | (26) | (32)
Fair Value | 4,062 | 5,963
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 4,062 | $ 5,963
U.S. government and agency securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 1,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 19 |
Gross Unrealized Loss | 0 |
Fair Value | 1,019 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 1,019 |
Restricted Cash and Investments |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 171,752 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Fair Value | 172,238 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Due in one year or less | 17,265 |
Due after one year through five years | 90,906 |
Due after five years through ten years | 63,581 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Due in one year or less | 17,248 |
Due after one year through five years | 90,825 |
Due after five years through ten years | 64,165 |
Fair Value | $ 172,238 |

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