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OTHER - Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year $ 194,871 $ 263,104 $ 236,317 $ 279,493
Balance at end of year 211,793 247,925 211,793 247,925
Accumulated translation adjustment:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (40,991) (35,374) (34,019) (33,727)
Other comprehensive income, before reclassifications 2,145 (2,385) (5,062) (4,032)
Amounts reclassified from accumulated other comprehensive loss 0 0 235 0
Other comprehensive income (loss), net of taxes 2,145 (2,385) (4,827) (4,032)
Balance at end of year (38,846) (37,759) (38,846) (37,759)
Accumulated deferred (losses) gains on cash flow hedges:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (1,612) 1,739 1,164 161
Other comprehensive income, before reclassifications (89) 294 (3,224) 1,895
Amounts reclassified from accumulated other comprehensive loss 305 (143) 664 (166)
Other comprehensive income (loss), net of taxes 216 151 (2,560) 1,729
Balance at end of year (1,396) 1,890 (1,396) 1,890
Income tax expense (benefit) 73 36 (856) 531
Accumulated effect of retirement benefit obligations:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (1,561) (1,025) (1,600) (1,050)
Amounts reclassified from accumulated other comprehensive loss 20 13 59 38
Balance at end of year (1,541) (1,012) (1,541) (1,012)
Accumulated other comprehensive  loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (44,164) (34,660) (34,455) (34,616)
Balance at end of year $ (41,783) $ (36,881) $ (41,783) $ (36,881)