Commitments and Contingencies 2 Narrative (Details) (USD $)			3 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 North Attleboro Site [Member]	Jul. 07, 2011 Attorney General of Commonwealth [Member]	Mar. 31, 2012 Jal 4 Facility [Member]	Mar. 31, 2012 Jal 3 Facility [Member]
Commitments And Contingencies [Line Items]
Site Contingency Loss Exposure Not Accrued Best Estimate			$ 10,500,000
Legal Fees				18,500,000
Percentage Of Recovery				50
Reimbursement Costs				150,000
Alleged Violations					500,000	5,500,000
Estimated Litigation Liability	$ 28,200,000	$ 28,300,000