Derivatives And Risk Management (Tables)

9 Months Ended

Sep. 30, 2011

Derivatives And Risk Management [Abstract]

Energy Commodity Derivatives

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
	Physical		Financial		Physical		Financial		Physical		Financial		Physical		Financial
Year	MWH		MWH		mmBTUs		mmBTUs		MWH		MWH		mmBTUs		mmBTUs
2011		609		343		12,539		29,225		184		113		5,407		26,983
2012		950		2,150		17,802		61,266		377		656		2,893		61,260
2013		398		1,751		7,105		52,155		254		1,013		1,533		49,428
2014		366		—		2,933		8,513		286		123		1,050		3,900
2015		379		—		675		1,125		286		—		—		—
Thereafter		1,315		—		—		—		1,017		—		—		—

Foreign Currency Exchange Contracts

	September 30, 2011			December 31, 2010
Number of contracts		30			29
Notional amount (in United States dollars)	$	11,310		$	10,916
Notional amount (in Canadian dollars)		11,208			10,989
Derivative in other current assets (liabilities)		(523	)		116

Interest Rate Swap Agreements

	September 30, 2011			December 31, 2010
Number of contracts		3			2
Notional amount	$	75,000		$	50,000
Mandatory cash settlement date		July 2012			July 2012
Number of contracts		2			—
Notional amount	$	85,000			—
Mandatory cash settlement date		June 2013			—
Derivative asset		—			127
Derivative liability		(14,225	)		(53	)

Derivative Instruments Summary

		Fair Value
							Net Asset (Liability)
Derivative	Balance Sheet Location	Asset		Liability
Foreign currency contracts	Other current liabilities	$	—	$	(523	)	$	(523	)
Interest rate contracts	Other current liabilities		—		(14,077	)		(14,077	)
Interest rate contracts	Other non-current liabilities and deferred credits		—		(148	)		(148	)
Commodity contracts	Current utility energy commodity derivative assets		1,478		(989	)		489
Commodity contracts	Non-current utility energy commodity derivative assets		12,345		(6,750	)		5,595
Commodity contracts	Current utility energy commodity derivative liabilities		24,668		(77,935	)		(53,267	)
Commodity contracts	Other non-current liabilities and deferred credits		20,643		(43,040	)		(22,397	)
Total derivative instruments recorded on the balance sheet		$	59,134	$	(143,462	)	$	(84,328	)

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2010 (in thousands):

		Fair Value
							Net Asset (Liability)
Derivative	Balance Sheet Location	Asset		Liability
Foreign currency contracts	Other current assets	$	116	$	—		$	116
Interest rate contracts	Other intangibles, property and investments-net		127		—			127
Interest rate contracts	Other non-current liabilities and deferred credits		—		(53	)		(53	)
Commodity contracts	Current utility energy commodity derivative assets		6,293		(3,701	)		2,592
Commodity contracts	Non-current utility energy commodity derivative assets		21,249		(5,988	)		15,261
Commodity contracts	Current utility energy commodity derivative liabilities		5,934		(57,417	)		(51,483	)
Commodity contracts	Other non-current liabilities and deferred credits		1,386		(32,371	)		(30,985	)
Total derivative instruments recorded on the balance sheet		$	35,105	$	(99,530	)	$	(64,425	)