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Business Combinations Business Combinations Narrative (Details) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
May 01, 2012
Business Acquisition [Line Items]      
Percentage of SmartSynch Voting Interests Acquired     100.00%
SmartSynch acquisition purchase price, net of cash acquired     $ 77,700,000
Cash Acquired from Acquisition 6,700,000    
Estimated cost to complete IPR&D projects   125,000  
Acquired IPR&D Projects, Upon Completion, Expected Weighted Average Useful Life   7 years  
Goodwill     46,101,000
Acquisition related costs   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     36,500,000
Gas Reporting Unit [Member]
     
Business Acquisition [Line Items]      
Goodwill     $ 9,600,000