Related Party And Affiliate Transactions (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Mar. 31, 2000	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 1997
Related Party Transaction [Line Items]
Due from affiliate, noncurrent		$ 1,025	$ 1,192
Affiliates [Member]
Related Party Transaction [Line Items]
Incurred and paid lease payments		1,614	1,550	1,556
Cypress Interstate Pipeline L.L.C [Member]
Related Party Transaction [Line Items]
Ownership interest		50.00%
Suzhou Huasu Plastics Company, Ltd. [Member]
Related Party Transaction [Line Items]
Ownership interest		59.00%
Percentage added to LIBOR for interest rate	2.00%
Loan to affiliates	2,000				5,150
Principal payments received		167	1,192	1,192
Interest received		8	74	441
American Air Liquide Holdings, Inc. [Member]
Related Party Transaction [Line Items]
Due to Related Parties		16,407
Notes Receivable From Affiliate [Member] | Prepaid Expenses And Other Current Assets [Member] | Suzhou Huasu Plastics Company, Ltd. [Member]
Related Party Transaction [Line Items]
Due from affiliate, current		1,192
Notes Receivable From Affiliate [Member] | Other Assets, Net [Member] | Suzhou Huasu Plastics Company, Ltd. [Member]
Related Party Transaction [Line Items]
Due from affiliate, noncurrent		1,025
Cypress Interstate Pipeline L.L.C [Member] | Corporate Joint Venture [Member]
Related Party Transaction [Line Items]
Pipeline fees incurred for usage		$ 13,328	$ 11,957	$ 9,474