Goodwill (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill	$ 61,261	$ 29,990
Goodwill, Acquired During Period	31,271
Olefins
Goodwill [Line Items]
Goodwill	29,990	29,990
Goodwill, Acquired During Period	0
Vinyls
Goodwill [Line Items]
Goodwill	31,271	0
Goodwill, Acquired During Period	$ 31,271