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Commitments and Contingencies (Details Textual 2) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Commitments [Line Items] |  |  |  |
Loss Contingency Insurance Policy Deductible for Each Line of Coverage Excluding Health |  | $ 1,000,000 |  |
Loss Contingency Health Insurance Deductible For Qualified Individuals |  | 100,000 |  |
Outstanding Performance Bonds |  | 912,000,000 |  |
Estimated Cost to Complete Bonded Projects |  | 87,000,000 |  |
Insurance Claims [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Loss Contingency Insurance Expense |  | 23,600,000 | $ 21,000,000 | $ 20,100,000
LE Myers Co [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Litigation Settlement, Amount |  | $ 230,000 |  |
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member] | LE Myers Co [Member] | Minimum [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Period During Which Defendant Operated Manufactured Gas Plant | 6 years |  |  |
Northern States Power Company Wisconsin Vs The City of Ashland Wisconsin [Member] | LE Myers Co [Member] | Maximum [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Period During Which Defendant Operated Manufactured Gas Plant | 12 years |  |  |

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- Definition Estimated cost to complete bonded projects. + References No definition available. + Details
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- Definition Represents the amount of deductible under health insurance benefits for qualified individuals. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Represents the insurance expenses, including premiums, for workers' compensation, general liability, automobile liability and employee health benefits. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of deductible up to the claim aggregate under insurance arrangements, for each line of coverage excluding auto liability and medical insurance, excluding health insurance. + References No definition available. + Details
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- Definition The total amount of outstanding performance bonds. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Represents the period during which the defendant operated a manufactured gas plant. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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