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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 $ 143,291 $ 116,920 $ 258,831
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 156,301 77,801 57,964
Stock-based compensation 56,980 40,547 28,451
Equity in losses of affiliated company 537
Accrued severance pay, net (788) 3 104
Amortization of premium and discount and accrued interest on marketable securities 646 2,441 2,799
Deferred taxes, net (70,805) (25,905) 10,576
Changes in operating assets and liabilities:      
Trade receivables, net 37,735 (31,784) (56,363)
Prepaid expenses and other current assets (6,839) 2,078 (1,482)
Trade payables 2,665 4,392 2,166
Accrued expenses and other liabilities 25,541 17,994 38,488
Deferred revenues 41,624 9,379 54,914
Long term liabilities (5,169) 7,529 2,453
Loss (gain) on disposal of discontinued operations 9,148 (147,334)
Realized gain on marketable securities (3,388) (32)
Amortization of discount on long-term debt 13,547 379
Other (67) 678 256
Net cash provided by operating activities 394,662 228,212 252,328
Cash flows from investing activities:      
Purchase of property and equipment (39,889) (27,278) (16,596)
Purchase of investments (133,423) (47,221) (287,593)
Proceeds from investments 64,295 449,880 92,542
Payments for business acquisitions, net of cash acquired (76,027) (1,156,249)
Investments in affiliates and other purchases (1,500) (1,500)
Capitalization of internal use software costs (27,936) (8,502) (1,380)
Proceeds (repayment) from sale of discontinued operations (9,148) 186,134
Net cash used in investing activities (212,980) (800,018) (28,393)
Cash flows from financing activities:      
Proceeds from issuance of shares upon exercise of options 19,240 23,525 27,532
Purchase of treasury shares (24,428) (43,630) (68,384)
Dividends paid (9,637) (38,202) (38,239)
Capital lease payments (137) (1,087)
Proceeds from issuance of debt, net of costs 464,841
Proceeds from issuance of exchangeable senior notes, net 260,135
Repayment of long-term debt (260,000)
Earn out payments related to acquisitions (297)
Net cash provided by (used in) financing activities (14,827) 405,447 (79,388)
Effect of exchange rate changes on cash 4,421 (2,546) (6,113)
Net change in cash and cash equivalents 171,276 (168,905) 138,434
Cash and cash equivalents at the beginning of the year 157,026 325,931 187,497
Cash and cash equivalents at the end of the year 328,302 157,026 325,931
Supplemental disclosure of cash flows activities:      
Income taxes 33,029 28,396 53,646
Interest 7,910 2,201 107
Non-cash activities:      
Net change in other receivables with respect to exercise of share options $ 138 $ (99) $ 434