Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 404,148	$ 270,124
Investments, at fair value	131,372	230,477
Accounts receivable, net of allowance of $200 and $57 as of June 30, 2020 and December 31, 2019, respectively	99,222	62,017
Goodwill	147,394	146,861
Intangible assets, net of accumulated amortization	59,552	60,986
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	78,461	71,795
Operating lease right-of-use assets	77,933	81,399
Prepaid expenses and other assets	41,102	30,770
Deferred tax assets, net	33	501
Total assets	1,039,217	954,930
Liabilities
Accrued employee compensation	39,434	47,365
Income and other tax liabilities	24,906	16,690
Deferred revenue	4,068	3,499
Accounts payable, accrued expenses and other liabilities	22,624	19,294
Operating lease liabilities	94,701	97,991
Total liabilities	185,733	184,839
Commitments and Contingencies (Note 12)
Stockholders' equity
Preferred stock
Common stock	122	122
Additional paid-in capital	327,970	342,541
Treasury stock - Common stock voting, at cost, 2,837,164 and 2,810,609 shares as of June 30, 2020 and December 31, 2019, respectively	(164,676)	(153,388)
Retained earnings	704,219	591,086
Accumulated other comprehensive loss	(14,151)	(10,270)
Total stockholders' equity	853,484	770,091
Total liabilities and stockholders' equity	1,039,217	954,930
Series A Preferred Stock [Member]
Stockholders' equity
Preferred stock