COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) employee	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Concentration Risk [Line Items]
Total number of employees | employee	3,402
Changes in warranty reserve
Balance, beginning of the year	$ 8,906	$ 8,513	$ 8,180
Provision for warranty claims	7,099	6,792	7,249
Warranty claims paid	(6,735)	(6,272)	(6,801)
Foreign currency translation adjustment	(96)	(127)	(115)
Balance, end of the year	$ 9,174	$ 8,906	$ 8,513
Carpenters Union Local 1615
Concentration Risk [Line Items]
Total number of hourly employees covered in an agreement | employee	203
Percent of employee covered in agreement	6.00%
Italy Unions
Concentration Risk [Line Items]
Total number of employees | employee	104
Unionized Employees Concentration Risk | Workforce Subject to Collective Bargaining Arrangements
Concentration Risk [Line Items]
Percentage of employees represented by unions	9.00%