v2.3.0.15
Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Equity available-for-sale securities$ 8,374$ 5,853
Fixed income available-for-sale securities69,60468,917
Fixed income securities owned20,0320
Trading securities issued by SIVs55,633100,645
Other trading securities3,4973,949
Assets, fair value157,140179,364
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
  
Equity available-for-sale securities8,3745,853
Fixed income available-for-sale securities00
Fixed income securities owned0 
Trading securities issued by SIVs00
Other trading securities3,4973,949
Assets, fair value11,8719,802
Significant Other Observable Inputs (Level 2) [Member]
  
Equity available-for-sale securities00
Fixed income available-for-sale securities69,60468,917
Fixed income securities owned20,032 
Trading securities issued by SIVs00
Other trading securities00
Assets, fair value89,63668,917
Significant Unobservable Inputs (Level 3) [Member]
  
Equity available-for-sale securities00
Fixed income available-for-sale securities00
Fixed income securities owned0 
Trading securities issued by SIVs55,633100,645
Other trading securities00
Assets, fair value$ 55,633$ 100,645