SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Sales by Product Line
Total net sales	$ 859,929	$ 787,936
Chlorovinyls
Sales by Product Line
Total net sales	329,512	326,319
Chlorovinyls | Electrovinyl products
Sales by Product Line
Total net sales	207,557	218,769
Chlorovinyls | Compound products
Sales by Product Line
Total net sales	121,955	107,550
Aromatics
Sales by Product Line
Total net sales	343,177	304,113
Aromatics | Cumene products
Sales by Product Line
Total net sales	251,758	180,746
Aromatics | Phenol/acetone products
Sales by Product Line
Total net sales	91,419	123,367
Building Products
Sales by Product Line
Total net sales	187,240	157,504
Building Products | Window & Door Profiles and Moulding products
Sales by Product Line
Total net sales	66,797	65,173
Building Products | Outdoor Building products
Sales by Product Line
Total net sales	$ 120,443	$ 92,331