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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 12,072 $ 12,062
Non-cash items included in net income:    
Income tax expense 9,219 8,608
Depreciation and amortization and other 316 220
Stock-based compensation 3,503 2,344
Deferred rent (68) (48)
Accretion to interest income and other 9 3
Changes in operating assets and liabilities:    
Accounts receivable 7,055 (6,356)
Other assets (774) (359)
Acquisition contingent payment 745 257
Fund management and administration payable (199) 2,640
Compensation and benefits payable (22,973) (3,230)
Accounts payable and other liabilities (2,128) 796
Net cash provided by operating activities 6,777 16,937
Cash flows from investing activities:    
Purchase of fixed assets (336) (20)
Purchase of investments   (8,449)
Acquisition less cash acquired (11,818)  
Proceeds from the redemption of investments 1,113 808
Net cash used in investing activities (11,041) (7,661)
Cash flows from financing activities:    
Dividends paid (10,913) (10,799)
Shares repurchased (35,555) (14,070)
Proceeds from exercise of stock options and warrants 75 2,125
Net cash used in financing activities (46,393) (22,744)
Increase/(decrease) in cash flow due to changes in foreign exchange rate 348 (115)
Net decrease in cash and cash equivalents (50,309) (13,583)
Cash and cash equivalents-beginning of year 210,070 165,284
Cash and cash equivalents-end of year 159,761 151,701
Supplemental disclosure of cash flow information:    
Cash paid for taxes $ 3,594 $ 350