GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	$ 401,301
Adjustment to preliminary allocation of purchase price for acquisition	1,084
Foreign currency translation adjustment	(536)
Gross goodwill at the end of the period	401,849
Accumulated impairment losses at the end of the period	(187,693)	(187,693)
Net goodwill at the end of the period	214,156	213,608
Chlorovinyls
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	242,855
Foreign currency translation adjustment	(536)
Gross goodwill at the end of the period	242,319
Accumulated impairment losses at the end of the period	(55,487)	(55,487)
Net goodwill at the end of the period	186,832	187,368
Building Products
Changes made to goodwill by reportable segment
Gross goodwill at the beginning of the period	158,446
Adjustment to preliminary allocation of purchase price for acquisition	1,084
Gross goodwill at the end of the period	159,530
Accumulated impairment losses at the end of the period	(132,206)	(132,206)
Net goodwill at the end of the period	$ 27,324	$ 26,240