Segment And Geographic Information (Capital Expenditures) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Capital expenditures	$ 431,104	$ 679,222	$ 386,882
Olefins [Member]
Segment Reporting Information [Line Items]
Capital expenditures	188,729	145,542	135,886
Vinyls [Member]
Segment Reporting Information [Line Items]
Capital expenditures	237,992	531,939	246,827
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 4,383	$ 1,741	$ 4,169