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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of components of accumulated other comprehensive (loss) income (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance $ (18,102) $ (17,969)
Change during the period:    
Before-tax amount 198 842
Tax benefit 12 5
Reclassification adjustment, net of taxes:    
Amortization of net loss [1] 270 254
Total activity for the period 480 1,101
Balance (17,622) (16,868)
Pension Adjustment    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance (15,503) (14,715)
Change during the period:    
Before-tax amount
Tax benefit
Reclassification adjustment, net of taxes:    
Amortization of net loss [1] 270 254
Total activity for the period 270 254
Balance (15,233) (14,461)
Unrealized Gain (Loss) On Securities    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance 39 36
Change during the period:    
Before-tax amount (33) (14)
Tax benefit 12 5
Reclassification adjustment, net of taxes:    
Amortization of net loss [1]
Total activity for the period (21) (9)
Balance 18 27
Foreign Currency Translation    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance (2,638) (3,290)
Change during the period:    
Before-tax amount 231 856
Tax benefit
Reclassification adjustment, net of taxes:    
Amortization of net loss [1]
Total activity for the period 231 856
Balance $ (2,407) $ (2,434)
[1] Reported as part of selling, general and administrative expenses.