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ACCUMULATED OTHER COMPREHENSIVE INCOME (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss)        
Balances     $ 87,347  
Balances $ 100,483   100,483  
Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss)        
Balances (6,580) $ (8,447) (5,586) $ (12,003)
Unrealized gain (loss) on cash flow hedges 121 (34) 936 (417)
Amounts reclassified from AOCI 16 79 52 239
Foreign currency translation (loss) gain (307) 1,829 (2,152) 5,608
Balances (6,750) (6,573) (6,750) (6,573)
Defined Benefit Plan Liability        
Accumulated Other Comprehensive Income (Loss)        
Balances (945) (822) (945) (822)
Balances (945) (822) (945) (822)
Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss)        
Balances 1,047 (253) 196 (30)
Unrealized gain (loss) on cash flow hedges 121 (34) 936 (417)
Amounts reclassified from AOCI 16 79 52 239
Balances 1,184 (208) 1,184 (208)
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss)        
Balances (6,682) (7,372) (4,837) (11,151)
Foreign currency translation (loss) gain (307) 1,829 (2,152) 5,608
Balances $ (6,989) $ (5,543) $ (6,989) $ (5,543)