Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Regulatory Assets and Liabilities (Tables) [Abstract]

Regulatory Assets and Liabilities

(In thousands)		2011		2010
Regulatory Assets
Environmental costs	$	584	$	1,123
Derivatives		42,356		19,230
Tax recovery related to AFUDC equity		4,400		4,400
Asset retirement obligation		5,847		5,634
Unfunded pension and other postretirement liability		148,467		78,659
Debt related costs		4,662		5,137
Pension and OPRB costs		2,468		5,090
Conservation costs		571		0
Medicare Part D subsidy		2,851		2,851
Other		976		693
Total regulatory assets	$	213,182	$	122,817
Regulatory Liabilities
Elm Road	$	3,649	$	4,652
Conservation costs		0		776
Income taxes		2,774		3,276
Non-ARO removal cost		13,116		12,285
Renewable energy credits		331		2,352
Other		593		431
Total regulatory liabilities	$	20,463	$	23,772