Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 17,386	$ 9,717
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	7,705	2,381
Provision (recoveries) for doubtful accounts	827	(178)
Share-based compensation	7,679	1,831
Recovery of key man life insurance	(6,000)
Non-cash interest and other	319	147
Effect of foreign currency on operations	(1,022)	640
Loss from equity investment	157
Deferred income taxes	(24,560)	1,839
Impairment of leaseholds, lease loss accrual and loss on disposal of fixed assets	2,838
Income allocated and fair value adjustment for mandatorily redeemable noncontrolling interests	10,766	1,450
Change in operating assets and liabilities:
Due from clearing brokers	13,258
Securities and other investments owned	(41,350)	16,515
Securities borrowed	129,998
Accounts receivable and advances against customer contracts	1,635	(1,871)
Goods held for sale or auction		(8,447)
Prepaid expenses and other assets	15,522	1,410
Accounts payable, accrued payroll and related expenses, accrued value added tax payable and other accrued expenses	(38,597)	3,032
Amounts due from related parties and partners	(12,313)	(488)
Securities sold, not yet purchased	7,700	(343)
Deferred revenue	(1,302)	963
Securities loaned	(139,425)
Auction and liquidation proceeds payable		(672)
Net cash (used in) provided by operating activities	(48,779)	27,926
Cash flows from investing activities:
Acquisition of Wunderlich, net of cash acquired $4,259	(25,478)
Cash acquired from acquisition of FBR & Co.	15,738
Acquisition of United Online, net of cash acquired $125,542 in 2016	(10,381)	(33,430)
Acquisition of other businesses	(2,052)
Purchases of property and equipment	(550)	(297)
Proceeds from key man life insurance	6,000
Proceeds from sale of property and equipment and intangible asset	619	15
Equity investment	(1,015)
Increase in restricted cash	(5,797)	(78,161)
Net cash provided by (used in) investing activities	(22,916)	(111,873)
Cash flows from financing activities:
Repayment of revolving line of credit		(272)
Proceeds from asset based credit facility	65,987	56,255
Repayment of asset based credit facility	(65,987)	(56,255)
Repayment of notes payable	(8,214)
Borrowings from participating note payable		61,400
Payment of contingent consideration	(1,250)	(1,250)
Proceeds from issuance of senior notes	89,330
Payment of debt issuance costs	(2,093)
Proceeds from issuance of common stock		22,999
Offering costs from issuance of common stock		(240)
Payment of employment taxes on vesting of restricted stock	(2,683)
Dividends paid	(13,493)	(571)
Distribution to noncontrolling interests	(2,878)	(1,680)
Net cash provided by financing activities	58,719	80,386
Decrease in cash and cash equivalents	(12,976)	(3,561)
Effect of foreign currency on cash	3,280	23
Net decrease in cash and cash equivalents	(9,696)	(3,538)
Cash and cash equivalents, beginning of year	112,105	30,012
Cash and cash equivalents, end of period	102,409	26,474
Supplemental disclosures:
Interest paid	11,513	505
Taxes paid	$ 11,668	$ 409