v3.8.0.1
VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Valuation And Qualifying Accounts Disclosure Line Items    
Balance at Beginning of Period $ 594 $ 609
Additions Charged To Cost And Expense   89
Valuation Allowances And Reserves Deductions   (104)
Balance at End of Period   594
Allowance For Doubtful Accounts [Member]    
Valuation And Qualifying Accounts Disclosure Line Items    
Balance at Beginning of Period 271 246
Additions Charged To Cost And Expense 1,599 87
Valuation Allowances And Reserves Deductions (1,278) (62)
Balance at End of Period 592 271
Business Restructuring Reserves [Member]    
Valuation And Qualifying Accounts Disclosure Line Items    
Balance at Beginning of Period 594 609
Additions Charged To Cost And Expense 3,150 89
Valuation Allowances And Reserves Deductions (1,945) (104)
Balance at End of Period 1,799 594
Employee Severance [Member]    
Valuation And Qualifying Accounts Disclosure Line Items    
Balance at Beginning of Period   20
Additions Charged To Cost And Expense 796 170
Valuation Allowances And Reserves Deductions (441) $ (190)
Balance at End of Period $ 355