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Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Summary of intangible assets        
Investment contracts $ 197,493 $ 269,489    
Accumulated amortization (180,356) (249,809)    
Definite-lived intangible assets, net 17,137 19,680    
Indefinite-lived intangible assets 32,416 32,416    
Intangible Assets, Net $ 49,553 $ 52,096 $ 50,124 $ 52,977