Investment Securities (Details 4) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Investment Securities
Amount of transfer between levels	$ 0	$ 0
Fair value of investments
Available-for-sale Securities	41,377	161,270
Trading Securities	29,813	82,013
Equity method securities	220,553
Total investment securities	291,743	243,283
Total
Fair value of investments
Total investment securities	291,743	243,283
Mortgage-backed securities
Fair value of investments
Trading Securities	20	28
Mortgage-backed securities \| Total
Fair value of investments
Trading Securities	20	28
Corporate bonds
Fair value of investments
Trading Securities	5
Corporate bonds \| Total
Fair value of investments
Trading Securities	5
Common Stock
Fair value of investments
Trading Securities	87	72
Common Stock \| Total
Fair value of investments
Trading Securities	87	72
Sponsored funds
Fair value of investments
Available-for-sale Securities	40,552	157,460
Trading Securities	29,701	81,913
Equity method securities	217,380
Sponsored funds \| Total
Fair value of investments
Available-for-sale Securities	40,552	157,460
Trading Securities	29,701	81,913
Equity method securities	217,380
Sponsored privately offered funds measured at net asset value
Fair value of investments
Available-for-sale Securities	825	3,810
Equity method securities	3,173
Sponsored privately offered funds measured at net asset value \| Total
Fair value of investments
Available-for-sale Securities	825	3,810
Equity method securities	3,173
Level 1
Fair value of investments
Total investment securities	287,720	239,445
Level 1 \| Common Stock
Fair value of investments
Trading Securities	87	72
Level 1 \| Sponsored funds
Fair value of investments
Available-for-sale Securities	40,552	157,460
Trading Securities	29,701	81,913
Equity method securities	217,380
Level 2
Fair value of investments
Total investment securities	25	28
Level 2 \| Mortgage-backed securities
Fair value of investments
Trading Securities	20	$ 28
Level 2 \| Corporate bonds
Fair value of investments
Trading Securities	$ 5

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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