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Condensed Consolidated Statement of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statement of Cash Flows [Abstract]    
Increase to property, plant and equipment $ (327,634) $ (272,116)
Changes in related accounts payable and accrued liabilities 636 4,594
Property, plant and equipment additions, net of equity AFUDC* $ (326,998) $ (267,522)