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OTHER - Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year $ 279,493 $ 210,279 $ 197,728
Balance at end of year 236,317 279,493 210,279
Accumulated translation adjustment:      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year (33,727) (27,821) (35,644)
OCI, before reclassifications, net of tax, attributable to parent (292) (5,906) 7,823
Balance at end of year (34,019) (33,727) (27,821)
Accumulated deferred gains (losses) on cash flow hedges:      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year 161 14 (3)
OCI, before reclassifications, net of tax, attributable to parent 1,212 161 17
Amounts reclassified from accumulated other comprehensive loss (209) (14) 0
Balance at end of year 1,164 161 14
Accumulated effect of retirement benefit obligations:      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of year (1,050) (1,518) (1,352)
OCI, before reclassifications, net of tax, attributable to parent (601) 373 (228)
Amounts reclassified from accumulated other comprehensive loss 51 95 62
Balance at end of year $ (1,600) $ (1,050) $ (1,518)