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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill by segment | The following table presents the details of goodwill by segment:
(in thousands) |  | Market Making |  | Execution Services |  | Corporate |  | Total
Balance as of December 31, 2017 |  | $ | 755,292 |  |  | $ | 89,591 |  |  | $ | — |  |  | $ | 844,883 |
Goodwill adjustment allocated to BondPoint |  | — |  |  | (8,300 | ) |  | — |  |  | (8,300 | )
Balance as of March 31, 2018 |  | $ | 755,292 |  |  | $ | 81,291 |  |  | $ | — |  |  | $ | 836,583 |
Schedule of acquired intangible assets | Acquired intangible assets consisted of the following as of March 31, 2018 and December 31, 2017:
|  | As of March 31, 2018
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Useful Lives (Years)
Purchased technology |  | $ | 110,000 |  |  | $ | 110,000 |  |  | $ | — |  |  | 1.4 | to | 2.5
ETF issuer relationships |  | 950 |  |  | 585 |  |  | 365 |  |  |  | 9 |
ETF buyer relationships |  | 950 |  |  | 586 |  |  | 364 |  |  |  | 9 |
Leases |  | 1,800 |  |  | 547 |  |  | 1,253 |  |  |  | 3 |
FCC licenses |  | 200 |  |  | 26 |  |  | 174 |  |  |  | 7 |
Technology |  | 60,000 |  |  | 15,047 |  |  | 44,953 |  |  | 1 | to | 6
Customer relationships |  | 49,000 |  |  | 2,843 |  |  | 46,157 |  |  | 12 | to | 17
Favorable occupancy leases |  | 5,895 |  |  | 612 |  |  | 5,283 |  |  |  | 7 |
Exchange memberships |  | 5,838 |  |  | — |  |  | 5,838 |  |  |  | Indefinite |
|  | $ | 234,633 |  |  | $ | 130,246 |  |  | $ | 104,387 |  |  |  |  |
|  | As of December 31, 2017
(in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Useful Lives (Years)
Purchased technology |  | $ | 110,000 |  |  | $ | 110,000 |  |  | $ | — |  |  | 1.4 | to | 2.5
ETF issuer relationships |  | 950 |  |  | 559 |  |  | 391 |  |  |  | 9 |
ETF buyer relationships |  | 950 |  |  | 560 |  |  | 390 |  |  |  | 9 |
Leases |  | 1,800 |  |  | 397 |  |  | 1,403 |  |  |  | 3 |
FCC licenses |  | 200 |  |  | 19 |  |  | 181 |  |  |  | 7 |
Technology |  | 60,000 |  |  | 9,644 |  |  | 50,356 |  |  | 1 | to | 6
Customer relationships |  | 49,000 |  |  | 1,822 |  |  | 47,178 |  |  | 12 | to | 17
Favorable occupancy leases |  | 5,895 |  |  | 408 |  |  | 5,487 |  |  |  | 7 |
Exchange memberships |  | 5,838 |  |  | — |  |  | 5,838 |  |  |  | Indefinite |
|  | $ | 234,633 |  |  | $ | 123,409 |  |  | $ | 111,224 |  |  |  |  |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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