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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 821,305 $ 802,923 $ 724,847
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation of property and equipment 16,402 12,876 10,883
Amortization of premium and accretion of discount on marketable securities, net 13,560 20,012 23,388
Realized loss (gain) on sale of marketable securities, net 1,803 176 (2,993)
Amortization of intangible assets 4,386 3,760 3,853
Stock-based compensation 89,327 87,459 82,732
Deferred income tax expense (benefit) 16,263 64,630 (32,594)
Excess tax benefit from stock-based compensation     (17,380)
Decrease (increase) in accrued severance pay, net (168) 711 147
Decrease (increase) in trade receivables, net (21,826) 6,284 (67,744)
Decrease in prepaid expenses and other current assets and other assets 1,984 5,615 11,234
Increase (decrease) in trade payables 6,636 (7,795) 2,184
Increase (decrease) in employees and payroll accruals 20,083 (4,546) 19,345
Increase (decrease) in income tax accrual and accrued expenses and other current liabilities [1] 28,357 (3,486) 31,565
Increase in deferred revenues 144,969 120,989 159,801
Net cash provided by operating activities 1,143,081 1,109,608 949,268
Cash flows from investing activities:      
Proceeds from maturity of marketable securities 1,464,384 1,363,698 1,525,929
Proceeds from sale of marketable securities 150,235 66,101 235,252
Proceeds from short-term bank deposits   106,609  
Investment in marketable securities (1,767,549) (1,686,445) (1,746,931)
Investment in short-term bank deposits (5,000)   (100,000)
Cash paid in conjunction with acquisition, net of acquired cash (154,902)    
Purchase of property and equipment (17,149) (28,784) (24,050)
Net cash used in investing activities (329,981) (178,821) (109,800)
Cash flows from financing activities:      
Proceeds from issuance of treasury shares upon exercise of options 353,501 127,518 129,196
Purchase of treasury shares at cost (1,103,865) (995,322) (987,897)
Payments related to shares withheld for taxes [1] (4,624) (5,397) (3,031)
Excess tax benefit from stock-based compensation     17,380
Net cash used in financing activities (754,988) (873,201) (844,352)
Increase (decrease) in cash and cash equivalents 58,112 57,586 (4,884)
Cash and cash equivalents at the beginning of the year 245,014 187,428 192,312
Cash and cash equivalents at the end of the year 303,687 245,014 187,428
Supplemental disclosure of cash flow information:      
Cash paid during the year for taxes on income 67,940 $ 143,036 $ 180,071
Non-cash investing activity      
Fair value of awards attributable to pre-acquisition services $ 2,187    
[1] Payments related to shares withheld for taxes during the year ended December 31, 2016 were reclassified from operating activity to financing activity following ASU 2016-09 adoption.