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Revenue from Contracts with Customers Revenue from Contracts with Customers - By Performance Obligation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 255,993 $ 272,796 $ 519,845 $ 546,297
Asset Management [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 168,127   342,393  
Administrative Service [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 48,370 $ 45,601 97,393 $ 92,302
Distribution [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 36,923   74,980  
Other [Member]        
Revenue from External Customer [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [3] $ 2,573   $ 5,079  
[1] The performance obligation may include administrative, distribution and other services recorded as a single asset management fee under Topic 606, as it is part of a unitary fee arrangement with a single performance obligation.
[2] The performance obligation is satisfied at a point in time and may include CDSC's and upfront commissions. A portion of this revenue relates to a performance obligation that has been satisfied in a prior period.
[3] Includes shareholder service fees recorded in Other Service Fees, net—Affiliates on the Consolidated Statements of Income.