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Commitments and Contingencies (Details 2) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Vehicular traffic accident | Sep. 30, 2013 L.E. Myers Co Vehicular traffic accident item | Jan. 31, 2013 L.E. Myers Co Northern States Power Company (Wisconsin) v. The City of Ashland, Wisconsin Minimum | Jan. 31, 2013 L.E. Myers Co Northern States Power Company (Wisconsin) v. The City of Ashland, Wisconsin Maximum | Dec. 31, 2013 Insurance and Claims Accruals | Dec. 31, 2012 Insurance and Claims Accruals | Dec. 31, 2011 Insurance and Claims Accruals | Dec. 31, 2013 Surety bonds
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |
Deductible per claim for each line of coverage, until claim aggregate is reached | $ 1,000,000 |  |  |  |  |  |  |  |  |
Deductible under health insurance benefits for qualified individuals | 100,000 |  |  |  |  |  |  |  |  |
Aggregate original face amount of outstanding bonds issued by the surety |  |  |  |  |  |  |  |  |  | 889,100,000
Estimated remaining cost to complete bonded projects |  |  |  |  |  |  |  |  |  | 147,600,000
Roll forward of activity in the insurance reserves |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 39,583,000 | 38,850,000 |  |  |  |  |  |  |  |
Net increases in reserves | 16,861,000 | 19,743,000 |  |  |  |  |  |  |  |
Net payments made | (17,333,000) | (19,010,000) |  |  |  |  |  |  |  |
Balance at end of period | 39,111,000 | 39,583,000 |  |  |  |  |  |  |  |
Insurance expense |  |  |  |  |  |  | 20,100,000 | 20,900,000 | 21,500,000 |
Compensatory damages |  |  |  | 700,000 |  |  |  |  |  |
Punitive damages |  |  |  | 3,600,000 |  |  |  |  |  |
Maximum number of times of compensatory damages for estimated punitive damages |  |  |  | 3 |  |  |  |  |  |
Reserve for legal settlements |  |  | 2,300,000 |  |  |  |  |  |  |
Period during which the defendant operated a manufactured gas plant |  |  |  |  | 6 years | 12 years |  |  |  |
Damages alleged |  |  |  |  |  | $ 140,000,000 |  |  |  |

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