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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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