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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities: |  |
Net income | $ 79,930 | $ 62,506
Adjustments to reconcile net income to cash provided by operating activities: |  |
Depreciation and amortization | 75,866 | 60,976
Gains from sale of investments | (53) | 0
Share-based compensation expense | 51,079 | 50,899
Operating lease right-of-use assets expense | 5,104 | 4,034
Deferred income tax benefit | (19,136) | (6,430)
Changes in operating assets and liabilities, exclusive of effects of acquired companies: |  |
Accounts receivable | (73,396) | (46,312)
Income tax receivable | 15,586 | 7,276
Prepaid expenses and other current assets | (6,033) | (10,434)
Accounts payable | 9,130 | (57,471)
Operating lease liabilities | (6,522) | (4,361)
Accrued liabilities | (24,723) | (30,217)
Deferred revenue | 17,474 | 20,868
Other long-term liabilities | 5,914 | 22
Net cash provided by operating activities | 130,220 | 51,356
Cash flows from investing activities: |  |
Additions to property and equipment | (12,757) | (14,223)
Purchase of marketable security investments | (4,592) | (68,054)
Proceeds and maturities from marketable security investments | 40,595 | 91,395
Investment in software | (16,463) | (8,947)
Cost of acquisitions, net of cash acquired | (117,313) | (1,998,902)
Other | 152 | 39
Net cash used by investing activities | (110,378) | (1,998,692)
Cash flows from financing activities: |  |
Net borrowings on revolving credit facility | 0 | 65,000
Payment on term loans | (80,000) | 0
Proceeds from term loans | 0 | 900,000
Proceeds from issuance of convertible senior notes | 0 | 600,000
Payment of debt issuance costs | 0 | (27,127)
Purchase of treasury shares | 0 | (12,975)
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award | (4,107) | 29,388
Contributions from employee stock purchase plan | 8,156 | 6,200
Net cash (used) provided by financing activities | (75,951) | 1,560,486
Net decrease in cash and cash equivalents | (56,109) | (386,850)
Cash and cash equivalents at beginning of period | 309,171 | 603,623
Cash and cash equivalents at end of period | $ 253,062 | $ 216,773

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