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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 199,223 $ 196,346 $ 185,904
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 184,092 182,026 173,230
Stock-based compensation 153,030 101,667 80,864
Accrued severance pay, net 597 1,323 (1,964)
Amortization of premium and discount and accrued interest on marketable securities 11,867 (633) (53)
Deferred taxes, net (39,316) (33,241) (12,208)
Changes in operating assets and liabilities:      
Trade receivables, net (85,778) 22,245 (29,863)
Prepaid expenses and other current assets (79,624) (80,665) (76,180)
Trade payables (389) 4,094 777
Accrued expenses and other liabilities 64,179 14,875 31,730
Operating lease right-of-use assets 15,075 18,167 19,104
Deferred revenues 30,770 63,202 13,810
Operating lease liabilities (18,011) (19,569) (18,839)
Amortization of discount on long-term debt 14,469 13,297 9,236
Loss in respect of debt extinguishment 13,969 0 0
Other (2,337) (2,828) (1,390)
Net cash provided by operating activities 461,816 480,306 374,158
Cash flows from investing activities:      
Purchase of property and equipment (24,771) (24,186) (27,293)
Purchase of investments (322,129) (583,115) (619,060)
Proceeds from investments 270,645 328,593 362,713
Payments for business acquisitions, net of cash acquired (142,804) (147,261) (25,972)
Capitalization of internal use software costs (42,440) (39,098) (34,679)
Net cash used in investing activities (261,499) (465,067) (344,291)
Cash flows from financing activities:      
Proceeds from issuance of shares upon exercise of options 4,426 8,865 5,428
Purchase of treasury shares (73,180) (48,272) (47,276)
Dividends paid to non-controlling interest (1,754) 0 0
Capital lease payments 0 (177) (816)
Purchase of subsidiaries shares from non-controlling interest (14,000) 0 0
Proceeds from issuance of exchangeable senior notes, net 0 451,421 0
Repayment of debt (177,308) (215,000) 0
Net cash provided by (used in) financing activities (261,816) 196,837 (42,664)
Effect of exchange rate changes on cash (2,112) 1,868 (979)
Net change in cash and cash equivalents (63,611) 213,944 (13,776)
Cash and cash equivalents at the beginning of the year 442,267 228,323 242,099
Cash and cash equivalents at the end of the year 378,656 442,267 228,323
Cash paid during the year for:      
Income taxes 97,258 83,251 65,200
Interest 688 7,829 11,493
Non-cash activities:      
Increase in accrued expenses and other liabilities with respect to purchase of treasury shares 4 112 35
Debt $ 292,940 $ 0 $ 0