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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 01, 2015
--- | --- | --- | ---
Fair Value Measurement [Line Items] |  |  |
Other restricted assets | $ 28,440 | $ 16,925 |
Restricted investments classified as held-to-maturity | 172,238 | 145,953 |
Contingent consideration | 0 | 21,600 |
Total fair value |  |  |
Fair Value Measurement [Line Items] |  |  |
Cash and cash equivalents | 28,780 | 34,970 |
Total fair value | Restricted Assets |  |  |
Fair Value Measurement [Line Items] |  |  |
Restricted cash and cash equivalents | 39,039 | 67,751 |
Other restricted assets | 28,440 | 16,925 |
Restricted investments classified as held-to-maturity | 172,238 | 145,953 |
Quoted prices in active markets for identical assets (level 1) |  |  |
Fair Value Measurement [Line Items] |  |  |
Cash and cash equivalents | 28,780 | 34,970 |
Contingent consideration |  | 0 |
Quoted prices in active markets for identical assets (level 1) | Restricted Assets |  |  |
Fair Value Measurement [Line Items] |  |  |
Restricted cash and cash equivalents | 39,039 | 67,751 |
Other restricted assets | 28,440 | 16,925 |
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 |
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 | 172,238 | 145,953 |
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 |
SIMOS Insourcing Solutions Corporation | Significant unobservable inputs (level 3) |  |  |
Fair Value Measurement [Line Items] |  |  |
Contingent consideration |  | $ 21,600 |

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