Consolidated Statements of Financial Condition (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 161,048	$ 168,924
Securities available-for-sale, at fair value	62,195	64,863
Accounts receivable, net of allowance of $62 and $3 as of March 31, 2015 and December 31, 2014, respectively	46,062	33,836
Goodwill and intangible assets, net of accumulated amortization	65,850	66,419
Furniture, equipment, leasehold improvements and capitalized software, net of accumulated depreciation and amortization	31,190	32,185
Prepaid expenses and other assets	7,207	6,685
Deferred tax assets, net	5,142	6,972
Total assets	378,694	379,884
Liabilities
Accrued employee compensation	8,960	25,310
Income and other tax liabilities	9,583	5,940
Deferred revenue	2,725	2,465
Accounts payable, accrued expenses and other liabilities	12,756	11,961
Total liabilities	34,024	45,676
Commitments and Contingencies (Note 10)
Stockholders’ equity
Additional paid-in capital	309,316	307,059
Treasury stock - Common stock voting, at cost, 2,258,744 and 2,141,344 shares as of March 31, 2015 and December 31, 2014, respectively	(79,186)	(70,247)
Retained earnings	118,943	101,813
Accumulated other comprehensive loss	(4,523)	(4,537)
Total stockholders’ equity	344,670	334,208
Total liabilities and stockholders’ equity	378,694	379,884
Undefined Preferred Stock [Member]
Stockholders’ equity
Preferred stock
Series A Preferred Stock [Member]
Stockholders’ equity
Preferred stock
Voting Common Stock [Member]
Stockholders’ equity
Common stock	120	120
Common Stock Non-Voting [Member]
Stockholders’ equity
Common stock