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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income        
Balances     $ 87,347  
Balances $ 95,525   95,525  
Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income        
Balances (3,295) $ (11,415) (5,586) $ (12,003)
Unrealized gain (loss) on cash flow hedges 247 (249) 815 (383)
Amounts reclassified from AOCI   112 36 160
Foreign currency translation (loss) gain (3,532) 3,105 (1,845) 3,779
Balances (6,580) (8,447) (6,580) (8,447)
Defined Benefit Plan Liability        
Accumulated Other Comprehensive Income        
Balances (945) (822) (945) (822)
Balances (945) (822) (945) (822)
Cash Flow Hedges        
Accumulated Other Comprehensive Income        
Balances 800 (116) 196 (30)
Unrealized gain (loss) on cash flow hedges 247 (249) 815 (383)
Amounts reclassified from AOCI   112 36 160
Balances 1,047 (253) 1,047 (253)
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income        
Balances (3,150) (10,477) (4,837) (11,151)
Foreign currency translation (loss) gain (3,532) 3,105 (1,845) 3,779
Balances $ (6,682) $ (7,372) $ (6,682) $ (7,372)