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RESTRICTED CASH AND INVESTMENTS (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
Restricted Cash and Investments [Line Items] |  |
Cash collateral held by insurance carriers | $ 23,035 | $ 22,926
Cash and cash equivalents held in Trust | 28,981 | 16,113
Investments held in Trust | 166,255 | 171,752
Deferred compensation mutual funds | 24,093 | 22,428
Other restricted cash and cash equivalents | 402 | 6,012
Restricted cash and investments | 242,766 | 239,231
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 294 | 1,324
Gross Unrealized Loss | (2,103) | (838)
Fair Value | 164,446 | 172,238
Estimated fair value |  |
Less than 12 months | 111,332 | 73,392
12 months or more | 20,153 | 20,600
Total | 131,485 | 93,992
Unrealized losses |  |
Less than 12 months | (1,409) | (445)
12 months or more | (694) | (393)
Total | $ (2,103) | $ (838)
Securities in unrealized loss positions, number of positions | security | 112 | 83
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | $ 164,446 | $ 172,238
Municipal debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 79,291 | 82,770
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 262 | 974
Gross Unrealized Loss | (910) | (378)
Fair Value | 78,643 | 83,366
Estimated fair value |  |
Less than 12 months | 42,461 | 23,078
12 months or more | 9,369 | 9,631
Total | 51,830 | 32,709
Unrealized losses |  |
Less than 12 months | (452) | (124)
12 months or more | (458) | (254)
Total | (910) | (378)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 78,643 | 83,366
Corporate debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 82,302 | 83,916
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 20 | 309
Gross Unrealized Loss | (1,140) | (434)
Fair Value | 81,182 | 83,791
Estimated fair value |  |
Less than 12 months | 66,664 | 48,952
12 months or more | 9,982 | 10,081
Total | 76,646 | 59,033
Unrealized losses |  |
Less than 12 months | (927) | (311)
12 months or more | (213) | (123)
Total | (1,140) | (434)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 81,182 | 83,791
Agency mortgage-backed securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 3,663 | 4,066
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 12 | 22
Gross Unrealized Loss | (45) | (26)
Fair Value | 3,630 | 4,062
Estimated fair value |  |
Less than 12 months | 1,216 | 1,362
12 months or more | 802 | 888
Total | 2,018 | 2,250
Unrealized losses |  |
Less than 12 months | (22) | (10)
12 months or more | (23) | (16)
Total | (45) | (26)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 3,630 | 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 | (8) | 0
Fair Value | 991 | 1,019
Estimated fair value |  |
Less than 12 months | 991 |
12 months or more | 0 |
Total | 991 |
Unrealized losses |  |
Less than 12 months | (8) |
12 months or more | 0 |
Total | (8) |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 991 | $ 1,019
Restricted Cash and Investments [Member] |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 166,255 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Fair Value | 164,446 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Due in one year or less | 17,960 |
Due after one year through five years | 86,743 |
Due after five years through ten years | 61,552 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Due in one year or less | 17,892 |
Due after one year through five years | 85,910 |
Due after five years through ten years | 60,644 |
Fair Value | $ 164,446 |

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Data Type: | na
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