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OTHER - Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year $ 236,317 $ 279,493 $ 210,279
Currency translation adjustment (235) 0 0
Derivative fair value adjustment (2,289) 1,003 147
Net (loss) income arising from retirement benefit obligations, net of tax 601 550 (468)
Balance at end of year 230,136 236,317 279,493
Accumulated translation adjustment:      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year (34,019) (33,727) (27,821)
OCI, before reclassifications, net of tax, attributable to parent (2,062) (292) (5,906)
Currency translation adjustment 235 0 0
Balance at end of year (35,846) (34,019) (33,727)
Accumulated deferred gains (losses) on cash flow hedges:      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year 1,164 161 14
Derivative fair value adjustment (3,273) 1,212 161
Amounts reclassified from accumulated other comprehensive loss 984 (209) (14)
Balance at end of year (1,125) 1,164 161
Accumulated effect of retirement benefit obligations:      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year (1,600) (1,050) (1,518)
Amounts reclassified from accumulated other comprehensive loss 79 51 95
Net (loss) income arising from retirement benefit obligations, net of tax (680) (601) 373
Balance at end of year (2,201) (1,600) (1,050)
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year (34,455) (34,616) (29,325)
Derivative fair value adjustment (2,289) 1,003 147
Net (loss) income arising from retirement benefit obligations, net of tax 601 550 (468)
Balance at end of year $ (39,172) $ (34,455) $ (34,616)