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 (loss)	$ 34,296	$ 36,846
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense, intangible asset and other amortization	11,621	4,430
Stock-based compensation	14,970	9,064
Excess tax benefit from stock-based compensation	0	(192)
Amortization of deferred commissions	1,666	1,900
Payments of deferred commissions	(2,104)	(1,405)
Equity in earnings of equity method investments	(1,150)	(444)
Realized (gain) loss on sale of equity method investment	0	(2,883)
Distributions from equity method investments	911	0
Sales (purchases) of trading securities, net	3,859	10,811
Loss on disposal of fixed assets	345	0
Deferred taxes, net	6,056	9,032
Changes in operating assets and liabilities:
Accounts receivable, net and other assets	(9,466)	(297)
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	(2,147)	(12,893)
Operating activities of consolidated investment products (CIP):
Net cash provided by (used in) operating activities	(103,783)	(1,130)
Cash Flows from Investing Activities:
Capital expenditures	(1,243)	(1,461)
Proceeds from sale of equity method investment	0	8,621
Equity method investment contributions	0	(2,471)
Acquisition of business (cash paid $471.4 million, less cash acquired $77.6 million)	(393,446)	0
Purchases of available-for-sale securities	(194)	(183)
Net cash provided by (used in) investing activities	(389,417)	4,609
Cash Flows from Financing Activities:
Issuance of debt	260,000	0
Repayments on credit facility and other debt	(30,970)	0
Payment of deferred financing costs	(15,549)	(1,442)
Proceeds from issuance of mandatory convertible preferred stock, net of issuance costs	111,004	0
Proceeds from issuance of common stock, net of issuance costs	109,487	0
Common stock dividends paid	(9,352)	(11,119)
Preferred stock dividends paid	(4,169)	0
Repurchases of common shares	(7,502)	(72,216)
Proceeds from exercise of stock options	106	428
Taxes paid related to net share settlement of restricted stock units	(3,436)	(1,518)
Excess tax benefits from stock-based compensation	0	192
Contributions of noncontrolling interests, net	18,448	3,959
Net cash provided by (used in) financing activities	796,576	78,410
Net increase (decrease) in cash and cash equivalents	303,376	81,889
Cash and cash equivalents, beginning of period	82,687	97,384
Cash and Cash Equivalents, End of Period	386,063	179,273
Non-Cash Investing Activities:
Change in accrual for capital expenditures	96	140
Non-Cash Financing Activities:
Increase (decrease) to noncontrolling interest due to consolidation (deconsolidation) of consolidated investment products, net	11,286	(48,292)
Stock issued for acquisition of business	21,738	0
Contingent consideration for acquisition of business	51,690	0
Common stock dividends payable	4,234	3,424
Preferred stock dividends payable	2,084	0
Accrued stock issuance costs	332	0
Consolidated entity excluding consolidated investment products
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Realized and unrealized (gains) losses on trading securities, net	(3,117)	(700)
Cash Flows from Financing Activities:
Cash and cash equivalents, beginning of period	64,588
Cash and Cash Equivalents, End of Period	164,867
Consolidated investment products
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Realized and unrealized (gains) losses on trading securities, net	(16,875)	(10,104)
Operating activities of consolidated investment products (CIP):
Purchases of investments by CIP	(527,214)	(388,272)
Sales of investments by CIP	377,238	325,929
Net purchases of short term investments by CIP	565	5,773
Sales (purchases) of securities sold short by CIP, net	209	(4,648)
Change in cash pledged or on deposit of CIP	262	9,644
Change in other assets of CIP	417	(893)
Change in liabilities of CIP	833	4,453
Amortization of discount on notes payable of CIP	5,042	3,719
Cash Flows from Investing Activities:
Change in cash and cash equivalents of consolidated investment products due to consolidation, net	5,466	103
Cash Flows from Financing Activities:
Payments on borrowings by CIP	(105,000)	(156,154)
Proceeds from issuance of notes payable by CIP	474,009	316,280
Repayment of notes payable by CIP	(500)	$ 0
Cash and cash equivalents, beginning of period	18,099
Cash and Cash Equivalents, End of Period	$ 221,196