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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:      
Products $ 318,946 $ 306,252 $ 317,900
Services 652,040 623,783 573,033
Cloud 361,166 85,507 35,934
Total revenues 1,332,152 1,015,542 926,867
Cost of revenues:      
Products 51,065 53,032 66,363
Services 225,020 250,022 222,784
Cloud 192,588 34,679 14,435
Total cost of revenues 468,673 337,733 303,582
Gross profit 863,479 677,809 623,285
Operating expenses:      
Research and development, net 181,107 141,528 128,485
Selling and marketing 361,328 268,349 225,817
General and administrative 129,071 116,569 90,349
Amortization of acquired intangibles 41,902 17,187 12,528
Total operating expenses 713,408 543,633 457,179
Operating income 150,071 134,176 166,106
Financial income (expenses) and other, net (20,411) 10,305 5,304
Income before taxes on income 129,660 144,481 171,410
Taxes on income (tax benefit) (13,631) 21,412 30,832
Net income from continuing operations 143,291 123,069 140,578
Discontinued operations:      
Gain on disposal and income (loss) from operations (8,235) 152,459
Taxes on income (tax benefit) (2,086) 34,206
Net income (loss) on discontinued operations (6,149) 118,253
Net income $ 143,291 $ 116,920 $ 258,831
Basic earnings per share from continuing operations $ 2.37 $ 2.06 $ 2.36
Basic earnings per share from discontinued operations (0.10) 1.99
Basic earnings per share 2.37 1.96 4.35
Diluted earnings per share from continuing operations 2.31 2.02 2.29
Diluted earnings per share from discontinued operations (0.10) 1.93
Diluted earnings per share $ 2.31 $ 1.92 $ 4.22
Weighted average number of shares used in computing:      
Basic earnings per share 60,444 59,667 59,552
Diluted earnings per share 62,119 61,035 61,281