PRODUCT WARRANTY COSTS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
PRODUCT WARRANTY COSTS
Maximum period of warranty services (in years)	3
Changes in the carrying amount of product warranty accruals
Balance at beginning of period	$ 16,879	$ 16,768
Charged to expense	4,978	5,181
Deductions	(5,259)	(5,195)
Foreign currency translation	394	(683)
Balance at end of period	$ 16,992	$ 16,071
Product warranty expense relative to sales (as a percent)	0.40%	0.50%