OTHER - Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	$ 233,406	$ 200,927	$ 230,136	$ 236,317
Balance at end of year	241,801	194,871	241,801	194,871
Accumulated translation adjustment:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(34,017)	(38,477)	(35,846)	(34,019)
Other comprehensive income, before reclassifications	352	(2,749)	2,181	(7,207)
Amounts reclassified from accumulated other comprehensive loss	2,042	235	2,042	235
Other comprehensive income (loss), net of taxes	2,394	(2,514)	4,223	(6,972)
Balance at end of year	(31,623)	(40,991)	(31,623)	(40,991)
Accumulated deferred losses on cash flow hedges:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(1,298)	(1,713)	(1,125)	1,164
Other comprehensive income, before reclassifications	(229)	(139)	(783)	(3,135)
Amounts reclassified from accumulated other comprehensive loss	465	240	846	359
Other comprehensive income (loss), net of taxes	236	101	63	(2,776)
Balance at end of year	(1,062)	(1,612)	(1,062)	(1,612)
Income tax expense (benefit)	73	69	54	(929)
Accumulated effect of retirement benefit obligations:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(2,174)	(1,580)	(2,201)	(1,600)
Amounts reclassified from accumulated other comprehensive loss	41	19	68	39
Balance at end of year	(2,133)	(1,561)	(2,133)	(1,561)
Accumulated other comprehensive  loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(37,489)	(41,770)	(39,172)	(34,455)
Balance at end of year	$ (34,818)	$ (44,164)	$ (34,818)	$ (44,164)