Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Property and Equipment and Capitalized Software
Amortization expense related to share based compensation	$ 2,400	$ 2,500
Securities Borrowed and Securities Loaned
Minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned	102.00%
Fair Value Measurements
Transfers of financial instruments between levels	$ 0	$ 0
Class B interests \| East MIP
Property and Equipment and Capitalized Software
Amortization expense related to share based compensation	300
Capitalized software development costs recognized upon the IPO	$ 20
Furniture, fixtures and equipment \| Minimum
Property and Equipment and Capitalized Software
Estimated useful lives	3 years
Furniture, fixtures and equipment \| Maximum
Property and Equipment and Capitalized Software
Estimated useful lives	7 years
Leasehold improvements
Property and Equipment and Capitalized Software
Estimated useful lives	7 years
Capitalized software \| Minimum
Property and Equipment and Capitalized Software
Estimated useful lives	1 year 4 months 24 days
Capitalized software \| Maximum
Property and Equipment and Capitalized Software
Estimated useful lives	2 years 6 months

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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