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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Cash flows from operating activities: |  |
Net income | $ 127,016 | $ 133,163
Adjustments to reconcile net income to cash provided by operating activities: |  |
Depreciation and amortization | 114,198 | 116,950
Losses from sale of investments | 1 | 44
Share-based compensation expense | 80,905 | 77,991
Change in fair value in available-for-sale investments | 0 | 0
Amortization of operating lease right-of-use assets | 12,258 | 9,240
Deferred income tax benefit | (44,000) | (32,845)
Other | 398 | 0
Changes in operating assets and liabilities, exclusive of effects of acquired companies: |  |
Accounts receivable | (37,768) | (34,163)
Income tax payable | (51,300) | 10,759
Prepaid expenses and other current assets | (11,594) | (6,568)
Accounts payable | 27,848 | (13,750)
Operating lease liabilities | (8,224) | (9,324)
Accrued liabilities | (10,607) | (23,797)
Deferred revenue | 28,357 | 20,592
Other long-term liabilities | 5,533 | 11,306
Net cash provided by operating activities | 233,021 | 259,598
Cash flows from investing activities: |  |
Additions to property and equipment | (12,506) | (17,441)
Purchase of marketable security investments | (10,617) | (20,428)
Proceeds and maturities from marketable security investments | 45,452 | 55,052
Investment in software development | (27,447) | (25,557)
Cost of acquisitions, net of cash acquired | (35,540) | (117,706)
Other | 48 | 326
Net cash used by investing activities | (40,610) | (125,754)
Cash flows from financing activities: |  |
Payment on term loans | (255,000) | (270,000)
Proceeds from exercise of stock options, net of withheld shares for taxes upon equity award settlement | 8,438 | 298
Contributions from employee stock purchase plan | 11,780 | 12,614
Net cash used by financing activities | (234,782) | (257,088)
Net decrease in cash and cash equivalents | (42,371) | (123,244)
Cash and cash equivalents at beginning of period | 173,857 | 309,171
Cash and cash equivalents at end of period | 131,486 | 185,927
Supplemental cash flow information: |  |
Cash paid for interest | 16,820 | 14,706
Cash paid for income taxes, net | 118,000 | 35,324
Non-cash investing and financing activities: |  |
Non-cash additions to property and equipment | $ 834 | $ 32

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