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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Cash flows from operating activities: |  |
Net income | $ 80,005 | $ 79,930
Adjustments to reconcile net income to cash provided by operating activities: |  |
Depreciation and amortization | 75,748 | 75,866
Losses (gains) from sale of investments | 2 | (53)
Share-based compensation expense | 53,924 | 51,079
Amortization of operating lease right-of-use assets | 6,569 | 5,104
Deferred income tax benefit | (39,665) | (19,136)
Other | 445 | 0
Changes in operating assets and liabilities, exclusive of effects of acquired companies: |  |
Accounts receivable | (51,508) | (73,396)
Income tax payable | (41,762) | 15,586
Prepaid expenses and other current assets | (20,122) | (6,033)
Accounts payable | 13,721 | 9,130
Operating lease liabilities | (5,324) | (6,522)
Accrued liabilities | (15,083) | (24,723)
Deferred revenue | (3,571) | 17,474
Other long-term liabilities | 2,146 | 5,914
Net cash provided by operating activities | 55,525 | 130,220
Cash flows from investing activities: |  |
Additions to property and equipment | (6,370) | (12,757)
Purchase of marketable security investments | (10,617) | (4,592)
Proceeds and maturities from marketable security investments | 37,107 | 40,595
Investment in software development | (18,753) | (16,463)
Cost of acquisitions, net of cash acquired | (1,875) | (117,313)
Other | 16 | 152
Net cash used by investing activities | (492) | (110,378)
Cash flows from financing activities: |  |
Payment on term loans | (120,000) | (80,000)
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award settlement | 2,123 | (4,107)
Contributions from employee stock purchase plan | 7,751 | 8,156
Net cash used by financing activities | (110,126) | (75,951)
Net decrease in cash and cash equivalents | (55,093) | (56,109)
Cash and cash equivalents at beginning of period | 173,857 | 309,171
Cash and cash equivalents at end of period | 118,764 | 253,062
Supplemental cash flow information: |  |
Cash paid for interest | 12,286 | 5,716
Cash paid for income taxes, net | 92,933 | 24,286
Non-cash investing and financing activities: |  |
Non-cash additions to property and equipment | $ 368 | $ 84

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