GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	$ 401,301
Foreign currency translation adjustment	2,253
Accumulated impairment losses at the end of the period	(187,693)	(187,693)
Gross goodwill at the end of the period	404,638
Adjustment to preliminary allocation of purchase price for acquisition	1,084
Net goodwill at the end of the period	216,945	213,608
Chlorovinyls
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	242,855
Foreign currency translation adjustment	2,253
Accumulated impairment losses at the end of the period	(55,487)	(55,487)
Gross goodwill at the end of the period	245,108
Net goodwill at the end of the period	189,621	187,368
Building Products
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	158,446
Accumulated impairment losses at the end of the period	(132,206)	(132,206)
Gross goodwill at the end of the period	159,530
Adjustment to preliminary allocation of purchase price for acquisition	1,084
Net goodwill at the end of the period	$ 27,324	$ 26,240