Commitments and Contingencies 2 Narrative (Details) (USD $)	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Mar. 31, 2012 North Attleboro Site [Member]	Jun. 30, 2012 Attorney General of Commonwealth [Member]	Mar. 31, 2012 Jal 4 Facility [Member]	Mar. 31, 2012 Jal 3 Facility [Member]	Jun. 30, 2012 FGT [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
Accrued liabilities, litigation and other claim-related	10,100,000	28,300,000
Estimated cost							2,500,000,000
Service agreement shipping terms (in years)	25
Contracted capacity							74.00%
Sponsor contributions loans receivable, net of repayments							37,000,000
Promissory note with unconsolidated investment							150,000,000
Debt instrument, one-month Eurodollar rate, basis spread on variable rate							1.50%
Proceeds from legal settlements							82,700,000
Interest awarded							$ 8,000,000