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INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 3,557 $ 10,930
Adjustments required to reconcile net income to net cash provided by operating activities:    
Depreciation 495 387
Equity-based compensation 4,424 3,688
Realized gain, net on sale of available-for-sale marketable securities (301) (91)
Amortization of premiums on available-for-sale marketable securities 1,171 946
Accrued interest on bank deposits (994) (1,402)
Unrealized foreign exchange loss (gain) 16 (56)
Changes in operating assets and liabilities:    
Increase in trade receivables (2,902) (899)
Decrease (increase) in prepaid expenses and other current assets (231) 669
Increase in deferred taxes, net (713) (549)
Increase (decrease) in trade payables (506) 448
Decrease in deferred revenues (352) (207)
Decrease in accrued expenses and other payables (790) (370)
Decrease in accrued payroll and related benefits (437) (1,197)
Increase in income taxes payable 237 1,165
Excess tax benefit from equity-based compensation   (710)
Increase (decrease) in accrued severance pay, net 62 (65)
Net cash provided by operating activities 2,736 12,687
Cash flows from investing activities:    
Purchase of property and equipment (826) (344)
Investment in bank deposits (31,000) (34,604)
Proceeds from bank deposits 40,575 34,353
Investment in available-for-sale marketable securities (59,127) (32,867)
Proceeds from maturity of available-for-sale marketable securities 7,758 12,330
Proceeds from sale of available-for-sale marketable securities 38,867 38,159
Investment in other company (934) (1,533)
Net cash provided by (used in) investing activities (4,687) 15,494
Cash flows from financing activities:    
Purchase of Treasury Stock (7,189) (23,652)
Proceeds from exercise of stock-based awards 2,385 1,526
Excess tax benefit from equity-based compensation   710
Net cash used in financing activities (4,804) (21,416)
Effect of exchange rate movements on cash (60) (39)
Increase (decrease) in cash and cash equivalents (6,815) 6,726
Cash and cash equivalents at the beginning of the period 18,422 14,954
Cash and cash equivalents at the end of the period 11,607 21,680
Supplemental information of cash-flows activities:    
Income and withholding taxes, net of refunds $ 789 $ 345