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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 685,866 $ 659,571 $ 652,800
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 10,358 9,178 8,545
Amortization of premium and accretion of discount on marketable securities, net and revaluation of short-term bank deposits 29,611 33,021 22,389
Realized gain on sale of marketable securities, net (16) (288) (2,311)
Amortization of intangible assets 3,612 2,106 3,020
Stock-based compensation 76,302 63,169 51,112
Deferred income tax expense (benefit) (15,847) (12,292) 28
Excess tax benefit from stock-based compensation (19,376) (11,669) (35,345)
Accrued severance pay, net 197 (407) 158
Decrease (increase) in trade receivables (43,384) 12,948 (5,893)
Increase in prepaid expenses and other current assets and other assets (21,404) (8,613) (816)
Increase in trade payables 5,183 1,879 1,287
Increase in employees and payroll accruals 13,835 2,698 22,404
Increase (decrease) in income tax accrual and accrued expenses and other current liabilities 101,235 (77,809) 11,975
Increase in deferred revenues 120,559 112,390 81,933
Net cash provided by operating activities 946,731 785,882 811,286
Cash flows from investing activities:      
Proceeds from maturity of marketable securities 1,479,241 1,233,866 1,110,176
Proceeds from sale of marketable securities 109,735 75,910 21,716
Proceeds from short-term bank deposits 321   248,571
Investment in marketable securities (1,628,287) (1,535,800) (1,916,832)
Investment in short-term bank deposits   (7,343)  
Cash paid in conjunction with acquisitions, net of acquired cash (96,544)    
Purchase of property and equipment (17,348) (12,736) (9,563)
Net cash used in investing activities (152,882) (246,103) (545,932)
Cash flows from financing activities:      
Proceeds from issuance of treasury shares upon exercise of options 102,852 70,266 67,127
Purchase of treasury shares at cost (985,735) (768,176) (534,196)
Excess tax benefit from stock-based compensation 19,376 11,669 35,345
Net cash used in financing activities (863,507) (686,241) (431,724)
Decrease in cash and cash equivalents (69,658) (146,462) (166,370)
Cash and cash equivalents at the beginning of the year 261,970 408,432 574,802
Cash and cash equivalents at the end of the year 192,312 261,970 408,432
Supplemental disclosure of cash flow information:      
Cash paid during the year for taxes on income 123,944 $ 239,245 173,234
Supplemental disclosure of non-cash activities:      
Replacement of restricted share units upon acquisitions $ 1,123    
Accrued liability with respect to treasury shares     $ 3,633