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Goodwill and Intangible Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill and Other Intangible Assets      
Gross carrying amount of goodwill $ 46,599,000 $ 46,599,000  
Indefinite-lived intangible tradenames 8,556,000 8,556,000  
Gross carrying amount of goodwill and other intangible assets 59,691,000 59,691,000  
Accumulated Amortization 2,558,000 2,223,000  
Net carrying amount of goodwill and other intangible assets 57,133,000 57,468,000  
Additional information on intangible assets      
Amortization expense 335,000 335,000 335,000
Intangible asset amortization expense      
2013 300,000    
2014 300,000    
2015 300,000    
2016 300,000    
2017 300,000    
Backlog
      
Goodwill and Other Intangible Assets      
Gross carrying amount of finite-lived intangible assets 521,000 521,000  
Accumulated Amortization 521,000 521,000  
Customer relationships
      
Goodwill and Other Intangible Assets      
Gross carrying amount of finite-lived intangible assets 4,015,000 4,015,000  
Accumulated Amortization 2,037,000 1,702,000  
Net carrying amount of goodwill and other intangible assets 1,978,000 2,313,000  
Additional information on intangible assets      
Estimated useful life 12 years    
Remaining amortization period P5Y10M24D    
T&D
      
Goodwill and Other Intangible Assets      
Gross carrying amount of goodwill 40,042,000 40,042,000  
C&I
      
Goodwill and Other Intangible Assets      
Gross carrying amount of goodwill $ 6,557,000 $ 6,557,000