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RESTRUCTURING AND ASSET IMPAIRMENT - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]                
Restructuring costs $ 1,856   $ 472 $ 2,494 $ 1,549      
Severance and retention costs liability 6,810 $ 6,856 7,010 6,810 7,010 $ 7,053 $ 6,531 $ 8,102
Accrued Compensation                
Restructuring Cost and Reserve [Line Items]                
Severance and retention costs liability 2,600   2,500 2,600 2,500      
RMS                
Restructuring Cost and Reserve [Line Items]                
Restructuring costs 289 18,100   1,327        
RMS | Maximum                
Restructuring Cost and Reserve [Line Items]                
Expected restructuring costs (not expected to exceed) 1,500     1,500        
Cash portion of expected amount (up to)       3,000        
Asset Impairments and Accelerated Depreciation | RMS                
Restructuring Cost and Reserve [Line Items]                
Restructuring costs   $ 17,700            
Severance and Transition Costs                
Restructuring Cost and Reserve [Line Items]                
Restructuring costs 1,856   323 2,472 1,340      
Severance and Transition Costs | Other Noncurrent Liabilities                
Restructuring Cost and Reserve [Line Items]                
Severance and retention costs liability 4,200   $ 4,500 4,200 $ 4,500      
Severance and Transition Costs | RMS                
Restructuring Cost and Reserve [Line Items]                
Restructuring costs $ 220     $ 743