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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | Jan. 01, 2017 | Dec. 25, 2015 | Dec. 01, 2015
--- | --- | --- | ---
Fair Value Measurement [Line Items] |  |  |
Other restricted assets | $ 16,925 | $ 11,944 |
Restricted investments classified as held-to-maturity | 145,953 | 128,245 |
Contingent consideration | 21,600 | 0 |
Total Fair Value |  |  |
Fair Value Measurement [Line Items] |  |  |
Cash and cash equivalents | 34,970 | 29,781 |
Total Fair Value | Restricted Assets |  |  |
Fair Value Measurement [Line Items] |  |  |
Restricted cash and cash equivalents | 67,751 | 49,680 |
Other restricted assets | 16,925 | 11,944 |
Restricted investments classified as held-to-maturity | 145,953 | 128,245 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value Measurement [Line Items] |  |  |
Cash and cash equivalents | 34,970 | 29,781 |
Contingent consideration | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted Assets |  |  |
Fair Value Measurement [Line Items] |  |  |
Restricted cash and cash equivalents | 67,751 | 49,680 |
Other restricted assets | 16,925 | 11,944 |
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 |
Contingent consideration | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Restricted Assets |  |  |
Fair Value Measurement [Line Items] |  |  |
Restricted cash and cash equivalents | 0 | 0 |
Other restricted assets | 0 | 0 |
Restricted investments classified as held-to-maturity | 145,953 | 128,245 |
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 |
Other restricted assets | 0 | 0 |
Restricted investments classified as held-to-maturity | 0 | 0 |
SIMOS Insourcing Solutions Corporation |  |  |
Fair Value Measurement [Line Items] |  |  |
Contingent consideration |  |  | $ 18,300
SIMOS Insourcing Solutions Corporation | Total Fair Value |  |  |
Fair Value Measurement [Line Items] |  |  |
Contingent consideration | 21,600 | 19,300 |
SIMOS Insourcing Solutions Corporation | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value Measurement [Line Items] |  |  |
Contingent consideration | $ 21,600 | $ 19,300 |

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