Segment And Geographic Information (Total Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total assets	$ 5,213,990	$ 4,060,909
Olefins [Member]
Segment Reporting Information [Line Items]
Total assets	1,785,895	1,557,510
Vinyls [Member]
Segment Reporting Information [Line Items]
Total assets	2,618,646	1,740,595
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 809,449	$ 762,804