CONTINGENT LIABILITIES AND COMMITMENTS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013 item	Jun. 30, 2012	Jun. 30, 2013 item	Jun. 30, 2012
Changes in the Company's warranty reserve
Balance, beginning of the year			$ 7,852,000
Provision for warranty claims			3,547,000
Warranty claims paid			(3,174,000)
Foreign currency translation adjustment			(25,000)
Balance, end of the period	8,200,000		8,200,000
CONTINGENT LIABILITIES AND COMMITMENTS
Total number of employees	3,195		3,195
Contingent liabilities and commitments, additional disclosure
Warranty expense	$ 1,800,000	$ 1,400,000	$ 3,500,000	$ 3,100,000
Carpenters Union, Local 1615
CONTINGENT LIABILITIES AND COMMITMENTS
Total number of hourly employees covered in an agreement	193		193
Italy Unions
CONTINGENT LIABILITIES AND COMMITMENTS
Total number of employees	198		198
Workforce subject to collective bargaining arrangements | Unionized employees concentration risk
CONTINGENT LIABILITIES AND COMMITMENTS
Total number of employees	0		0
Percentage of employees represented by unions			12.20%