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Business Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Operating Income $ 7,210 $ 6,738 $ 11,087 $ 11,506  
Net Income 3,725 3,625 5,532 6,255  
Capital Expenditures     12,574 11,039  
Assets 545,141   545,141   537,536
Regulated
          
Segment Reporting Information [Line Items]          
Revenues 24,442 23,437 45,300 44,673  
Operating Income 6,878 6,317 10,381 10,652  
Net Income 3,557 3,372 5,144 5,745  
Capital Expenditures 6,296 6,024 12,335 10,856  
Assets 544,458   544,458   539,947
Non - Regulated
          
Segment Reporting Information [Line Items]          
Revenues 3,089 2,774 5,847 5,615  
Operating Income 332 421 706 854  
Net Income 168 253 388 510  
Capital Expenditures 140 127 239 183  
Assets 10,862   10,862   10,325
Inter-segment Elimination
          
Segment Reporting Information [Line Items]          
Revenues (130) (109) (200) (190)  
Assets (10,179)   (10,179)   (12,736)
Consolidated
          
Segment Reporting Information [Line Items]          
Number of Reportable Segments     2    
Revenues 27,401 26,102 50,947 50,098  
Operating Income 7,210 6,738 11,087 11,506  
Net Income 3,725 3,625 5,532 6,255  
Capital Expenditures 6,436 6,151 12,574 11,039  
Assets $ 545,141   $ 545,141   $ 537,536