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Variable Interest Entities (Schedule Of Variable Interest Entities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Other Receivable [Member]    
Variable Interest Entity [Line Items]    
Net assets $ 1,531 $ 1,902
Other Investments, At Fair Value [Member]    
Variable Interest Entity [Line Items]    
Net assets 11,603 21,528
Other Assets [Member]    
Variable Interest Entity [Line Items]    
Net assets 13,134 23,430
Managed Variable Interest Entity [Member] | Other Receivable [Member]    
Variable Interest Entity [Line Items]    
Net assets 1,466 1,829
Managed Variable Interest Entity [Member] | Other Assets [Member]    
Variable Interest Entity [Line Items]    
Net assets 1,466 1,829
Third-Party Managed Variable Interest Entity [Member] | Other Receivable [Member]    
Variable Interest Entity [Line Items]    
Net assets 65 73
Third-Party Managed Variable Interest Entity [Member] | Other Investments, At Fair Value [Member]    
Variable Interest Entity [Line Items]    
Net assets 11,603 21,528
Third-Party Managed Variable Interest Entity [Member] | Other Assets [Member]    
Variable Interest Entity [Line Items]    
Net assets $ 11,668 $ 21,601