Cash (Tables)

3 Months Ended

Mar. 31, 2018

Cash Restricted or Segregated Under Regulations and Other

Summary of cash, cash equivalents and restricted cash shown in the statement of cash flows

	March 31,		December 31,
	2018		2017
Cash and cash equivalents	$	230,314	$	287,452
Cash restricted or segregated under regulations and other		19,242		18,599
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$	249,556	$	306,051