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Geographic Information and Business Segments (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Schedule of total revenues by geographic area | The following table presents total revenues by geographic area for the three months ended March 31, 2018 and 2017:
(in thousands) |  | 2018 |  | 2017
Revenues: |  |  |  |
United States |  | $ | 743,152 |  |  | $ | 91,987 |
Ireland |  | 14,023 |  |  | 28,251 |
United Kingdom |  | 11,600 |  |  | — |
Singapore |  | 46,200 |  |  | 27,006 |
Others |  | 78 |  |  | 43 |
Total revenues |  | 815,053 |  |  | 147,287 |
Schedule of revenues, income (loss) before income taxes (“Pre-tax earnings”) and total assets by segment | The Company’s total revenues and income before income taxes and noncontrolling interest (“Pre-tax earnings”) by segment for the three months ended March 31, 2018 and 2017 are summarized in the following table:
(in thousands) | Market Making |  | Execution Services |  | Corporate (1) |  | Consolidated Total
2018: |  |  |  |  |  |  |
Total revenue | $ | 432,536 |  |  | $ | 383,779 |  |  | $ | (1,262 | ) |  | $ | 815,053 |
Income before income taxes and noncontrolling interest | 163,163 |  |  | 331,185 |  |  | (25,812 | ) |  | 468,536 |
2017: |  |  |  |  |  |  |
Total revenue | $ | 144,448 |  |  | $ | 2,779 |  |  | $ | 60 |  |  | $ | 147,287 |
Income (loss) before income taxes and noncontrolling interest | 23,465 |  |  | 489 |  |  | (72 | ) |  | 23,882 |
(1) Amounts shown in the Corporate segment include eliminations of income statement and balance sheet items included in the Company's other segments.

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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