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Condensed Consolidated Statement of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statement of Cash Flows [Abstract]    
Increase to property, plant and equipment $ (109,985) $ (80,361)
Changes in related accounts payable and accrued liabilities 24,169 18,750
Property, plant and equipment additions, net of equity AFUDC* $ (85,816) $ (61,611)