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Geographic Information and Business Segments - Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Total revenue | $ 362,991 | $ 815,053
Income (loss) before income taxes and noncontrolling interest | (16,204) | 468,536
Market Making |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 279,221 | 432,536
Income (loss) before income taxes and noncontrolling interest | 47,539 | 163,163
Execution Services |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 83,518 | 383,779
Income (loss) before income taxes and noncontrolling interest | (44,405) | 331,185
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 252 | (1,262)
Income (loss) before income taxes and noncontrolling interest | $ (19,338) | $ (25,812)

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