COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) employee	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Concentration Risk [Line Items]
Total number of employees | employee	3,541
Changes in warranty reserve
Balance, beginning of the year	$ 9,174	$ 8,906	$ 8,513
Provision for warranty claims	7,726	7,099	6,792
Warranty claims incurred	(7,898)	(6,735)	(6,272)
Warranties acquired through business acquisition	611	0	0
Foreign currency translation adjustment	10	(96)	(127)
Balance, end of the year	$ 9,623	$ 9,174	$ 8,906
Carpenters Union Local 1615
Concentration Risk [Line Items]
Total number of hourly employees covered in an agreement | employee	187
Percent of employee covered in agreement	5.30%
Italy Unions
Concentration Risk [Line Items]
Total number of employees | employee	104
Percent of employee covered in agreement	2.90%
Unionized Employees Concentration Risk | Workforce Subject to Collective Bargaining Arrangements
Concentration Risk [Line Items]
Percentage of employees represented by unions	8.20%