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Information Relating to Segment Statement of Income (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenue, Net $ 283,237,000 $ 279,826,000 $ 743,406,000 $ 660,497,000
Net Income (Loss) 19,820,000 30,518,000 67,938,000 73,715,000
Mark-to-market gain (loss) on certain interest rate swaps, net of tax   12,000,000   17,000,000
Intersegment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net (32,925,000) (30,299,000) (66,891,000) (61,357,000)
Net Income (Loss) 0 (3,000) 0 0
Corporate activities[Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 0 0 0 0
Net Income (Loss) (1,151,000) 11,679,000 [1] (821,000) 17,378,000 [1]
Consolidation, Eliminations [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 0 0 0 0
Electric Utilities [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 158,740,000 154,338,000 336,835,000 312,821,000
Net Income (Loss) 11,427,000 10,610,000 26,002,000 22,966,000
Electric Utilities [Member] | Intersegment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 3,144,000 3,694,000 7,151,000 7,841,000
Gas Utilities [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 102,499,000 105,836,000 361,836,000 305,648,000
Net Income (Loss) 1,994,000 3,192,000 26,692,000 21,675,000
Gas Utilities [Member] | Intersegment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 0 0 0 0
Power Generation [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 1,267,000 1,031,000 2,536,000 2,053,000
Net Income (Loss) 7,194,000 5,031,000 15,267,000 10,675,000
Power Generation [Member] | Intersegment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 20,713,000 19,094,000 41,792,000 38,432,000
Coal Mining [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 5,583,000 6,807,000 12,201,000 12,817,000
Net Income (Loss) 2,016,000 1,973,000 4,480,000 3,038,000
Coal Mining [Member] | Intersegment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 9,068,000 7,511,000 17,948,000 15,084,000
Oil and Gas [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net 15,148,000 11,814,000 29,998,000 27,158,000
Net Income (Loss) (1,660,000) (1,964,000) (3,682,000) (2,017,000)
Oil and Gas [Member] | Intersegment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Revenue, Net $ 0 $ 0 $ 0 $ 0
[1] Corporate activities include a $12 million and a $17 million after-tax non-cash mark-to-market gain for the three and six months ended June 30, 2013, respectively on certain interest rate swaps.