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Intangible Assets and Goodwill Intangible Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 659,189 $ 659,315  
Finite-Lived Intangible Assets, Period Increase (Decrease) (17,500)    
Finite-Lived Intangible Assets, Amortization Expense 1,000 1,400 $ 2,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 600    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 600    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 500    
Renewable investment advisory contracts [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) 70,400 70,600  
Trade Names [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 1,900 $ 1,900