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Revenue - Breakdown of Revenues Between Fixed and Variable (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenues        
Total revenue $ 297,138 $ 260,840 $ 608,624 $ 534,239
Transaction fees and commissions        
Revenues        
Total revenue 237,669 205,381 489,474 423,197
Refinitiv market data fees        
Revenues        
Total revenue 15,426 14,926 30,984 30,043
Other        
Revenues        
Total revenue 2,503 2,650 5,171 5,248
Variable        
Revenues        
Total revenue 201,898 167,332 416,360 347,674
Variable | Transaction fees and commissions        
Revenues        
Total revenue 201,199 166,655 414,935 346,322
Variable | Subscription fees        
Revenues        
Total revenue 485 460 960 922
Variable | Refinitiv market data fees        
Revenues        
Total revenue 0 0 0 0
Variable | Other        
Revenues        
Total revenue 214 217 465 430
Fixed        
Revenues        
Total revenue 95,240 93,508 192,264 186,565
Fixed | Transaction fees and commissions        
Revenues        
Total revenue 36,470 38,726 74,539 76,875
Fixed | Subscription fees        
Revenues        
Total revenue 41,055 37,423 82,035 74,829
Fixed | Refinitiv market data fees        
Revenues        
Total revenue 15,426 14,926 30,984 30,043
Fixed | Other        
Revenues        
Total revenue $ 2,289 $ 2,433 $ 4,706 $ 4,818