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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 457,100
Other comprehensive income (loss)	$ (2,398)	$ 613	178	$ (3,955)
Tax Provision	(148)	202	112	992
Other comprehensive income (loss), net of tax			290	(2,963)
Balance, end of period	439,659		439,659
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(34,392)	(19,796)
Balance, end of period	(34,102)	(22,759)	(34,102)	(22,759)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(30,607)	(21,366)
Other comprehensive income (loss)			(473)	(4,419)
Tax Provision			273	1,108
Balance, end of period	(31,080)	(25,785)	(31,080)	(25,785)
Foreign Currency Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			3,904	3,246
Other comprehensive income (loss)			651	464
Tax Provision			(161)	(116)
Balance, end of period	4,555	3,710	4,555	3,710
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(7,859)	(7,221)
Other comprehensive income (loss)			0	0
Balance, end of period	(7,859)	(7,221)	(7,859)	(7,221)
Tax Provision
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			170	5,545
Tax Provision			112	992
Balance, end of period	$ 282	$ 6,537	$ 282	$ 6,537