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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 6,880 $ 12,072
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred income taxes 6,302 9,219
Stock-based compensation 3,421 3,503
Depreciation and amortization 337 316
Other 120 (59)
Changes in operating assets and liabilities:    
Securities owned, at fair value 1,292  
Accounts receivable (1,553) 7,055
Prepaid expenses 127 (960)
Other assets 64 186
Acquisition payable (3,538) 745
Fund management and administration payable (400) (199)
Compensation and benefits payable (9,772) (22,973)
Income taxes payable 177 (2,879)
Securities sold, but not yet purchased, at fair value (1,222)  
Accounts payable and other liabilities 212 751
Net cash provided by operating activities 2,447 6,777
Cash flows from investing activities:    
Purchase of fixed assets (193) (336)
Purchase of securities held-to-maturity (759)  
Purchase of securities available-for-sale (21,340)  
Proceeds from held-to-maturity securities maturing or called prior to maturity 51 1,113
Proceeds from sales and maturities of securities available-for-sale 21,000  
Acquisition less cash acquired   (11,818)
Net cash used in investing activities (1,241) (11,041)
Cash flows from financing activities:    
Dividends paid (10,930) (10,913)
Shares repurchased (3,628) (35,555)
Proceeds from exercise of stock options 5 75
Net cash used in financing activities (14,553) (46,393)
Increase in cash flow due to changes in foreign exchange rate 262 348
Net decrease in cash and cash equivalents (13,085) (50,309)
Cash and cash equivalents - beginning of period 92,722 210,070
Cash and cash equivalents - end of period 79,637 159,761
Supplemental disclosure of cash flow information:    
Cash paid for taxes $ 1,247 $ 3,594