Segment And Geographic Information (Total Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 5,575,252	$ 5,213,990
Olefins [Member]
Segment Reporting Information [Line Items]
Total assets	1,869,888	1,785,895
Vinyls [Member]
Segment Reporting Information [Line Items]
Total assets	2,638,833	2,618,646
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 1,066,531	$ 809,449