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Recent Accounting Pronouncements Recent Accounting Pronouncements Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 255,993 | $ 272,796 | $ 519,845 | $ 546,297 |
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption - Change in Amortization Period |  |  |  |  | $ (8,100)
Cumulative Effect of New Accounting Principle in Period of Adoption - CDSC Revenue |  |  |  |  | 8,000
Other Noncurrent Assets [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption - Change in Amortization Period |  |  |  |  | 8,100
Cumulative Effect of New Accounting Principle in Period of Adoption - CDSC Revenue |  |  |  |  | $ (8,000)
Distribution and Shareholder Service [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 39,496 | 46,414 | 80,059 | 90,373 |
Distribution and Shareholder Service [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 500 |  | 800 |  |
Investment Advice-Affiliates [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 130,531 | 145,205 | 265,762 | 293,124 |
Investment Advice-Affiliates [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (8,200) |  | (16,800) |  |
Investment Advice-Other [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 37,596 | $ 34,117 | 76,631 | $ 67,515 |
Investment Advice-Other [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 1,600 |  | $ 3,300 |  |

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