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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:          
Net income $ 25,530 $ 53,892 $ 62,506 $ 101,442  
Adjustments to reconcile net income to cash provided by operating activities:          
Depreciation and amortization     60,976 40,270  
Share-based compensation expense     50,899 35,688  
Operating lease right-of-use assets expense     4,034 2,843  
Deferred income tax benefit     (6,430) (3,729)  
Changes in operating assets and liabilities, exclusive of effects of    acquired companies:          
Accounts receivable     (46,312) (30,332)  
Income tax receivable     7,276 (21,453)  
Prepaid expenses and other current assets     (10,434) (9,870)  
Accounts payable     (57,471) (6,338)  
Operating lease liabilities     (4,361) (3,375)  
Accrued liabilities     (30,217) (19,136)  
Deferred revenue     20,868 10,510  
Increase in other long term liabilities     22 0  
Net cash provided by operating activities     51,356 96,520  
Cash flows from investing activities:          
Additions to property and equipment     (14,223) (16,268)  
Purchase of marketable security investments     (68,054) (79,747)  
Proceeds from marketable security investments     91,395 40,020  
Purchase of investment in common shares     0 (10,000)  
Proceeds from the sale of investment in preferred shares     0 15,000  
Investment in software     (8,947) (2,695)  
Cost of acquisitions, net of cash acquired     (1,998,902) (261)  
Decrease (increase) in other     39 (328)  
Net cash used by investing activities     (1,998,692) (54,279)  
Cash flows from financing activities:          
Increase in net borrowings on revolving credit facility     65,000 0  
Proceeds from term loans     900,000 0  
Proceeds from issuance of convertible senior notes     600,000 0  
Payment of debt issuance costs     (27,127) 0  
Purchase of treasury shares     (12,975) (15,482)  
Payment of contingent consideration     0 (5,619)  
Proceeds from exercise of stock options     29,388 92,337  
Contributions from employee stock purchase plan     6,200 5,177  
Net cash provided by financing activities     1,560,486 76,413  
Net (decrease) increase in cash and cash equivalents     (386,850) 118,654  
Cash and cash equivalents at beginning of period     603,623 232,682 $ 232,682
Cash and cash equivalents at end of period $ 216,773 $ 351,336 $ 216,773 $ 351,336 $ 603,623