Other Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 31, 2013 Olefins [Member]	Oct. 31, 2013 Minimum [Member]	Oct. 31, 2013 Maximum [Member]
Other Assets [Line Items]
Amortization expense of other assets	$ 30,045	$ 25,131	$ 22,812
Future amortization expense, 2013	8,885
Future amortization expense, 2014	8,714
Future amortization expense, 2015	8,585
Future amortization expense, 2016	7,789
Future amortization expense, 2017	$ 7,305
Number of years forecasted to test for impairment of goodwill				9 years
Discounted cash flow projections period					2014	2022
Rate used to discount future cash flows for goodwill impairment test				8.80%
Percentage future cash flows of segment could decrease by and not be impaired				20.00%