ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Loss Included Within Shareholders' Equity (Details) - USD ($) $ in Thousands	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, beginning of period			$ 436,670
Other comprehensive income (loss)	$ 3,301	$ 488	(6,175)	$ 2,576
Tax Provision	319	329	134	260
Other comprehensive income (loss), net of tax			(6,041)	2,836
Balance, end of period	218,936		218,936
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(30,190)	(34,392)
Balance, end of period	(36,231)	(31,556)	(36,231)	(31,556)
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)			(6,158)	2,481
Tax Provision			129	333
Balance, end of period	(32,900)	(28,126)	(32,900)	(28,126)
Foreign Currency Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			4,186	3,904
Other comprehensive income (loss)			(17)	95
Tax Provision			5	(73)
Balance, end of period	4,169	3,999	4,169	3,999
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			134	260
Balance, end of period	$ 521	$ 430	$ 521	$ 430