Commitments And Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Reimbursement of remediation costs sought by PolyOne	$ 1,400
Rental expense, net of railcar mileage credits	38,199	36,644	38,506
Accrual for Environmental Loss Contingencies	500
PolyOne [Member]
Loss Contingencies [Line Items]
Percentage of costs related to environmental issues to be paid by PolyOne	100.00%
Costs incurred environmental remediation services	$ 2,687	$ 3,287