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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