Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ 50,367	$ 47,056
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense, intangible asset and other amortization	19,810	13,641
Stock-based compensation	11,384	12,073
Amortization of deferred commissions	1,805	1,646
Payments of deferred commissions	(973)	(2,600)
Equity in earnings of equity method investments	(1,209)	(1,801)
Distributions received from equity method investments	675	669
Sales (purchases) of investments, net	13,767	6,150
Deferred taxes, net	252	1,374
Changes in operating assets and liabilities:
Accounts receivable, net and other assets	(2,394)	(5,469)
Accrued compensation and benefits, accounts payable, accrued liabilities and other liabilities	(44,325)	(45,713)
Operating activities of consolidated investment products (CIP):
Net cash provided by (used in) operating activities	(143,668)	(154,513)
Cash Flows from Investing Activities:
Capital expenditures and other asset purchases	(6,111)	(2,274)
Sale of available-for-sale securities	2,044	37,785
Purchases of available-for-sale securities	0	(20,188)
Net cash provided by (used in) investing activities	(5,638)	15,323
Cash Flows from Financing Activities:
Repayments on debt	(24,825)	(1,300)
Payment of deferred financing costs	0	(3,548)
Common stock dividends paid	(8,392)	(6,735)
Preferred stock dividends paid	(4,168)	(4,168)
Repurchases of common shares	(22,499)	(7,500)
Stock options exercised	643	698
Taxes paid related to net share settlement of restricted stock units	(6,509)	(5,238)
Net subscriptions received from (redemptions/distributions paid to) noncontrolling interests	6,599
Net subscriptions received from (redemptions/distributions paid to) noncontrolling interests		(2,140)
Net cash provided by (used in) financing activities	145,934	85,436
Net increase (decrease) in cash, cash equivalents and restricted cash	(3,372)	(53,754)
Cash, cash equivalents and restricted cash, beginning of period	254,656	234,282
Cash, Cash Equivalent and Restricted Cash, End of Period	251,284	180,528
Non-Cash Investing Activities:
Change in accrual for capital expenditures	(1,813)	(439)
Non-Cash Financing Activities:
Increase (decrease) to noncontrolling interest due to consolidation (deconsolidation) of CIP, net	(6,423)	0
Common stock dividends payable	3,849	3,225
Preferred stock dividends payable	2,084	2,084
Reconciliation of cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash at end of period	254,656	234,282
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 investments, net	(4,634)	(1,398)
Consolidated Investment Products
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Realized and unrealized (gains) losses on investments, net	(13,222)	(608)
Operating activities of consolidated investment products (CIP):
Purchases of investments by CIP	(532,342)	(641,236)
Sales of investments by CIP	348,771	465,213
Net purchases (sales) of short term investments by CIP	(309)	97
Sales (purchases) of securities sold short by CIP, net	1,193	187
Change in other assets of CIP	71	(829)
Change in liabilities of CIP	3,140	(2,965)
Amortization of discount on notes payable of CIP	4,505	0
Cash Flows from Investing Activities:
Change in cash and cash equivalents of CIP due to consolidation (deconsolidation), net	(1,571)	0
Cash Flows from Financing Activities:
Proceeds from issuance of notes payable by CIP	400,782	784,867
Repayment of notes payable by CIP	$ (195,697)	$ (669,500)