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Joint Plant Ownership (Tables)
12 Months Ended
Dec. 31, 2011
Columbia Units [Member]
 
Joint Plant Ownership (Tables) [Line Items]  
Joint Plant Ownership
 (In thousands) 2011 2010 
 Utility plant$118,227$114,760 
 Accumulated depreciation (76,371) (73,771) 
 Property, plant, and equipment, net$41,856$40,989 
Elm Road Units [Member]
 
Joint Plant Ownership (Tables) [Line Items]  
Joint Plant Ownership
 (In thousands) 2011 2010 
 Nonregulated plant$195,926$122,603 
 Accumulated depreciation (6,763) (2,481) 
 Property, plant, and equipment, net$189,163$120,122 
 Construction work in progress 732 72,193 
 Total property, plant, and equipment$189,895$192,315 
West Campus [Member]
 
Joint Plant Ownership (Tables) [Line Items]  
Joint Plant Ownership
 (In thousands) 2011 2010 
 Nonregulated plant$109,620$109,152 
 Accumulated depreciation (18,265) (15,521) 
 Property, plant, and equipment, net$91,355$93,631