Segment And Geographic Information (Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Capital expenditures	$ 491,426	$ 431,104	$ 679,222
Olefins [Member]
Segment Reporting Information [Line Items]
Capital expenditures	304,873	188,729	145,542
Vinyls [Member]
Segment Reporting Information [Line Items]
Capital expenditures	176,582	237,992	531,939
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 9,971	$ 4,383	$ 1,741