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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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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