Commitments and Contingencies 2 Narrative (Details) (USD $)	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2012 North Attleboro Site [Member]	Sep. 30, 2012 Attorney General of Commonwealth [Member]	Mar. 31, 2012 Jal 4 Facility [Member]	Mar. 31, 2012 Jal 3 Facility [Member]	Sep. 30, 2012 Mercury Release [Member]	Sep. 30, 2012 Accrued Liabilities [Member]	Dec. 31, 2011 Accrued Liabilities [Member]
Commitments And Contingencies [Line Items]
Estimated remediation costs to completion	$ 10,500,000
Legal fees		18,500,000
Level of recovery		50.00%
Reimbursed expert and consultant costs, maximum		150,000
Alleged regulatory violations			500,000	5,500,000
Jugment Range - Minimum					50,000
Jugment Range - Maximum					500,000
Community Service Obligation					12,000,000
Accrued liabilities, litigation and other claim-related						9,300,000	28,300,000
Alleged Violations					$ 750,000