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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 802,923 $ 724,847 $ 685,866
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 12,876 10,883 10,358
Amortization of premium and accretion of discount on marketable securities, net 20,012 23,388 29,611
Realized loss (gain) on sale of marketable securities, net 176 (2,993) (16)
Amortization of intangible assets 3,760 3,853 3,612
Stock-based compensation 87,459 82,732 76,302
Deferred income tax expense (benefit) 64,630 (32,594) (15,847)
Excess tax benefit from stock-based compensation   (17,380) (19,376)
Decrease in accrued severance pay, net 711 147 197
Decrease (increase) in trade receivables, net 6,284 (67,744) (43,384)
Decrease (increase) in prepaid expenses and other current assets and other assets 5,615 11,234 (21,404)
Increase (decrease) in trade payables (7,795) 2,184 5,183
Increase (decrease) in employees and payroll accruals (4,546) 19,345 13,835
Increase (decrease) in income tax accrual and accrued expenses and other current liabilities [1] (3,486) 31,565 104,006
Increase in deferred revenues 120,989 159,801 120,559
Net cash provided by operating activities 1,109,608 949,268 949,503
Cash flows from investing activities:      
Proceeds from maturity of marketable securities 1,363,698 1,525,929 1,479,241
Proceeds from sale of marketable securities 66,101 235,252 109,735
Proceeds from short-term bank deposits 106,609   321
Investment in marketable securities (1,686,445) (1,746,931) (1,628,287)
Investment in short-term bank deposits   (100,000)  
Cash paid in conjunction with acquisitions, net of acquired cash     (96,544)
Purchase of property and equipment (28,784) (24,050) (17,348)
Net cash used in investing activities (178,821) (109,800) (152,882)
Cash flows from financing activities:      
Proceeds from issuance of treasury shares upon exercise of options 127,518 129,196 102,852
Purchase of treasury shares at cost (995,322) (987,897) (985,735)
Payments related to shares withheld for taxes [1] (5,397) (3,031) (2,771)
Excess tax benefit from stock-based compensation   17,380 19,376
Net cash used in financing activities (873,201) (844,352) (866,278)
Increase (decrease) in cash and cash equivalents 57,586 (4,884) (69,658)
Cash and cash equivalents at the beginning of the year 187,428 192,312 261,970
Cash and cash equivalents at the end of the year 245,014 187,428 192,312
Supplemental disclosure of cash flow information:      
Cash paid during the year for taxes on income $ 143,036 $ 180,071 123,944
Supplemental disclosure of non-cash activities:      
Replacement of restricted share units upon acquisitions     $ 1,123
[1] Payments related to shares withheld for taxes during the years ended December 31, 2016 and 2015 were reclassified from operating activity to financing activity following ASU 2016-09 adoption.