ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Loss Included Within Shareholders' Equity (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, beginning of period			$ 436,670
Other comprehensive income (loss)	$ 2,570	$ (2,398)	(3,605)	$ 178
Tax Provision	(60)	(148)	74	112
Other comprehensive income (loss), net of tax			(3,531)	290
Balance, end of period	213,500		213,500
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(30,190)	(34,392)
Balance, end of period	(33,721)	(34,102)	(33,721)	(34,102)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(26,742)	(30,607)
Other comprehensive income (loss)			(2,978)	(473)
Tax Provision			(81)	273
Balance, end of period	(29,720)	(31,080)	(29,720)	(31,080)
Foreign Currency Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			4,186	3,904
Other comprehensive income (loss)			(627)	651
Tax Provision			155	(161)
Balance, end of period	3,559	4,555	3,559	4,555
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(8,021)	(7,859)
Other comprehensive income (loss)			0	0
Balance, end of period	(8,021)	(7,859)	(8,021)	(7,859)
Tax Provision
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			387	170
Tax Provision			74	112
Balance, end of period	$ 461	$ 282	$ 461	$ 282