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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
years
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Ecova [Member]
Dec. 31, 2008
Cadence Network [Member]
Dec. 31, 2010
Ecos [Member]
Dec. 31, 2012
Prenova [Member]
Dec. 31, 2011
The Loyalton Group [Member]
Dec. 31, 2012
Maximum [Member]
Software Development Costs [Member]
Nov. 30, 2011
Client Relationships [Member]
Prenova [Member]
Dec. 31, 2012
Client Relationships [Member]
Prenova [Member]
Jan. 31, 2012
Client Relationships [Member]
LPB Energy Management [Member]
Dec. 31, 2012
Client Relationships [Member]
LPB Energy Management [Member]
Nov. 30, 2011
Internal Use Software [Member]
Prenova [Member]
Dec. 31, 2012
Internal Use Software [Member]
Prenova [Member]
Jan. 31, 2012
Internal Use Software [Member]
Minimum [Member]
LPB Energy Management [Member]
Dec. 31, 2012
Internal Use Software [Member]
Minimum [Member]
LPB Energy Management [Member]
Jan. 31, 2012
Internal Use Software [Member]
Maximum [Member]
LPB Energy Management [Member]
Dec. 31, 2012
Other Intangibles Property and Investments Net [Member]
Prenova [Member]
Summary Of Significant Accounting Policies [Line Items]                                      
Quantifying Misstatement in Current Year Financial Statements, Amount   $ 7,600,000 $ 10,500,000                                
Owners percentage interest       79.00%                              
Noncontrolling interest, percentage 21.00%                                    
Investment portfolio percentage rated AA or higher 97.00% 88.00%                                  
Proceeds from sales, maturities and calls of securities available for sale 137,999,000 80,000 0                                
Gross realized gains 500,000                                    
Assets, adjustment                     $ (400,000)       $ (2,100,000)       $ (800,000)
Period of time receiving power, years 32.5                                    
Estimated amortization period         12 years 3 years 9 years 6 years 4 years 9 years   10 years 10 years 5 years   3 years 3 years 4 years  
Average effective maturity 1 year 10 months 24 days 1 year 3 months 18 days