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Business Combinations Business Combinations Narrative (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
years
May 01, 2012
Business Acquisition [Line Items]      
Percentage of SmartSynch Voting Interests Acquired     100.00%
Business acquisition purchase price, net of cash acquired     $ 77,700,000
Cash acquired from acquisition   6,800,000  
Business acquisition, original estimated purchase price     100,000,000
Estimated cost to complete IPR&D projects 2,300,000 2,300,000  
Acquired IPR&D Projects, Upon Completion, Expected Weighted Average Useful Life (Years)   7  
Goodwill     46,881,000
Acquisition related costs 44,000 3,000,000  
Elimination of Acquisition Related Expenses [Member]
     
Business Acquisition [Line Items]      
Significant non-recurring pro forma adjustments, net of estiamted tax   5,100,000  
Electricity Reporting Unit [Member]
     
Business Acquisition [Line Items]      
Goodwill     37,300,000
Gas Reporting Unit [Member]
     
Business Acquisition [Line Items]      
Goodwill     $ 9,600,000