Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Revenue	$ 331,555	$ 273,255
Service Revenue [Member]
Revenue	206,030	183,123
Commission Revenue [Member]
Revenue	103,975	93,484
Fees Revenue [Member]
Revenue	102,055	89,639
Inventory Sales Revenue [Member]
Revenue	$ 125,525	$ 90,132

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details