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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Acquired intangible assets
Accumulated Amortization	$ 130,246		$ 123,409
Net Carrying Amount	104,387		111,224
Gross Carrying Amount	234,633		234,633
Net Carrying Amount	104,387		111,224
Amortization expense relating to finite-lived intangible assets	6,851	$ 53
Exchange memberships
Acquired intangible assets
Indefinite-lived intangibles	5,838		5,838
Purchased technology
Acquired intangible assets
Gross Carrying Amount	110,000		110,000
Accumulated Amortization	110,000		110,000
Net Carrying Amount	$ 0		$ 0
Purchased technology | Minimum
Acquired intangible assets
Useful Lives	1 year 4 months 24 days		1 year 4 months 24 days
Purchased technology | Maximum
Acquired intangible assets
Useful Lives	2 years 6 months		2 years 6 months
ETF issuer relationships
Acquired intangible assets
Gross Carrying Amount	$ 950		$ 950
Accumulated Amortization	585		559
Net Carrying Amount	$ 365		$ 391
Useful Lives	9 years		9 years
ETF buyer relationships
Acquired intangible assets
Gross Carrying Amount	$ 950		$ 950
Accumulated Amortization	586		560
Net Carrying Amount	$ 364		$ 390
Useful Lives	9 years		9 years
Leases
Acquired intangible assets
Gross Carrying Amount	$ 1,800		$ 1,800
Accumulated Amortization	547		397
Net Carrying Amount	$ 1,253		$ 1,403
Useful Lives	3 years		3 years
FCC licenses
Acquired intangible assets
Gross Carrying Amount	$ 200		$ 200
Accumulated Amortization	26		19
Net Carrying Amount	$ 174		$ 181
Useful Lives	7 years		7 years
Technology
Acquired intangible assets
Gross Carrying Amount	$ 60,000		$ 60,000
Accumulated Amortization	15,047		9,644
Net Carrying Amount	$ 44,953		$ 50,356
Technology | Minimum
Acquired intangible assets
Useful Lives	1 year		1 year
Technology | Maximum
Acquired intangible assets
Useful Lives	6 years		6 years
Customer relationships
Acquired intangible assets
Gross Carrying Amount	$ 49,000		$ 49,000
Accumulated Amortization	2,843		1,822
Net Carrying Amount	$ 46,157		$ 47,178
Customer relationships | Minimum
Acquired intangible assets
Useful Lives	12 years		12 years
Customer relationships | Maximum
Acquired intangible assets
Useful Lives	17 years		17 years
Favorable leases
Acquired intangible assets
Gross Carrying Amount	$ 5,895		$ 5,895
Accumulated Amortization	612		408
Net Carrying Amount	$ 5,283		$ 5,487
Useful Lives	7 years		7 years

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-Publisher FASB
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