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RESTRICTED CASH AND INVESTMENTS (Details) $ in Thousands | Jul. 01, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |
Cash collateral held by insurance carriers | $ 22,726 | $ 22,926
Cash and cash equivalents held in Trust | 25,447 | 16,113
Investments held in Trust | 166,424 | 171,752
Deferred compensation mutual funds | 24,384 | 22,428
Other restricted cash and cash equivalents | 409 | 6,012
Restricted cash and investments | 239,390 | 239,231
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 315 | 1,324
Gross Unrealized Loss | (2,107) | (838)
Fair Value | 164,632 | 172,238
Estimated fair value |  |
Less than 12 months | 109,004 | 73,392
12 months or more | 19,285 | 20,600
Total | 128,289 | 93,992
Unrealized losses |  |
Less than 12 months | (1,431) | (445)
12 months or more | (676) | (393)
Total | $ (2,107) | $ (838)
Securities in unrealized loss positions, number of positions | security | 114 | 83
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | $ 164,632 | $ 172,238
Municipal debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 78,675 | 82,770
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 304 | 974
Gross Unrealized Loss | (789) | (378)
Fair Value | 78,190 | 83,366
Estimated fair value |  |
Less than 12 months | 37,263 | 23,078
12 months or more | 9,329 | 9,631
Total | 46,592 | 32,709
Unrealized losses |  |
Less than 12 months | (350) | (124)
12 months or more | (439) | (254)
Total | (789) | (378)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 78,190 | 83,366
Corporate debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 83,481 | 83,916
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 5 | 309
Gross Unrealized Loss | (1,248) | (434)
Fair Value | 82,238 | 83,791
Estimated fair value |  |
Less than 12 months | 69,369 | 48,952
12 months or more | 8,980 | 10,081
Total | 78,349 | 59,033
Unrealized losses |  |
Less than 12 months | (1,042) | (311)
12 months or more | (206) | (123)
Total | (1,248) | (434)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 82,238 | 83,791
Agency mortgage-backed securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 3,269 | 4,066
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 6 | 22
Gross Unrealized Loss | (46) | (26)
Fair Value | 3,229 | 4,062
Estimated fair value |  |
Less than 12 months | 1,397 | 1,362
12 months or more | 976 | 888
Total | 2,373 | 2,250
Unrealized losses |  |
Less than 12 months | (15) | (10)
12 months or more | (31) | (16)
Total | (46) | (26)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 3,229 | 4,062
U.S. government and agency securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 999 | 1,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 0 | 19
Gross Unrealized Loss | (24) | 0
Fair Value | 975 | 1,019
Estimated fair value |  |
Less than 12 months | 975 |
12 months or more | 0 |
Total | 975 |
Unrealized losses |  |
Less than 12 months | (24) |
12 months or more | 0 |
Total | (24) |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 975 | $ 1,019
Restricted Cash and Investments [Member] |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 166,424 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Fair Value | 164,632 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Due in one year or less | 24,233 |
Due after one year through five years | 91,941 |
Due after five years through ten years | 50,250 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Due in one year or less | 24,101 |
Due after one year through five years | 91,148 |
Due after five years through ten years | 49,383 |
Fair Value | $ 164,632 |

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