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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period     $ (23,878)  
Accumulated other comprehensive loss at end of period $ (24,084)   (24,084)  
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Operating and maintenance expenses 186,379 $ 185,510 560,021 $ 549,935
Total, pre-tax (276,946) (237,132) (610,610) (557,716)
Tax expense 103,865 82,973 228,063 195,362
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period (24,086) (23,573) (23,878) (23,338)
Other comprehensive income (loss) before reclassifications (17) (17) (14) (15)
Gains reclassified from net accumulated other comprehensive loss 19 (119) (192) (356)
Net current period other comprehensive loss 2 (136) (206) (371)
Accumulated other comprehensive loss at end of period (24,084) (23,709) (24,084) (23,709)
Gains and Losses on Cash Flow Hedges | Amounts Reclassified from Accumulated Other Comprehensive Loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total, pre-tax 24 (191) (315) (573)
Tax expense (5) 72 123 217
Total, net of tax 19 (119) (192) (356)
Gains and Losses on Cash Flow Hedges | Interest Rate Derivatives | Amounts Reclassified from Accumulated Other Comprehensive Loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest charges [1] 9 (184) (353) (546)
Gains and Losses on Cash Flow Hedges | Vehicle Fuel Derivatives | Amounts Reclassified from Accumulated Other Comprehensive Loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Operating and maintenance expenses [2] $ 15 $ (7) $ 38 $ (27)
[1] Included in interest charges.
[2] Included in O&M expenses