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Commitments and Contingencies (Details Textual 2) - USD ($)
 1 Months Ended 6 Months Ended
Jan. 31, 2013
Jun. 30, 2015
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   942,200,000
Estimated Cost to Complete Bonded Projects   133,100,000
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