Investments - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Cost	$ 63,703
Fair Value	59,271
Cost		$ 67,802
Fair Value		69,101
Sponsored funds
Debt Securities, Available-for-sale [Line Items]
Cost	43,507
Fair Value	40,191
Cost		50,845
Fair Value		50,614
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	16,380
Fair Value	16,981
Cost		13,141
Fair Value		15,810
Trading debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	3,816
Fair Value	$ 2,099
Cost		3,816
Fair Value		$ 2,677

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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