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OTHER - Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year $ 200,927,000 $ 276,311,000 $ 236,317,000 $ 279,493,000
Balance at end of year 194,871,000 263,104,000 194,871,000 263,104,000
Accumulated translation adjustment:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (38,477,000) (32,421,000) (34,019,000) (33,727,000)
Other comprehensive income, before reclassifications (2,749,000) (2,953,000) (7,207,000) (1,647,000)
Amounts reclassified from accumulated other comprehensive loss 235,000 0 235,000 0
Other comprehensive income (loss), net of taxes (2,514,000) (2,953,000) (6,972,000) (1,647,000)
Balance at end of year (40,991,000) (35,374,000) (40,991,000) (35,374,000)
Accumulated deferred gains on cash flow hedges:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (1,713,000) 757,000 1,164,000 161,000
Other comprehensive income, before reclassifications (139,000) 1,034,000 (3,135,000) 1,601,000
Amounts reclassified from accumulated other comprehensive loss 240,000 (52,000) 359,000 (23,000)
Other comprehensive income (loss), net of taxes 101,000 982,000 (2,776,000) 1,578,000
Balance at end of year (1,612,000) 1,739,000 (1,612,000) 1,739,000
Income tax expense (benefit) 69,000 306,000 (929,000) 495,000
Accumulated effect of retirement benefit obligations:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (1,580,000) (1,037,000) (1,600,000) (1,050,000)
Amounts reclassified from accumulated other comprehensive loss 19,000 12,000 39,000 25,000
Balance at end of year (1,561,000) (1,025,000) (1,561,000) (1,025,000)
Accumulated other comprehensive  loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of year (41,770,000) (32,701,000) (34,455,000) (34,616,000)
Balance at end of year $ (44,164,000) $ (34,660,000) $ (44,164,000) $ (34,660,000)