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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
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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.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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