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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities: |  |
Net income | $ 99,737 | $ 115,910
Adjustments to reconcile net income to cash provided by operating activities: |  |
Depreciation and amortization | 56,547 | 45,627
Share-based compensation expense | 44,369 | 37,966
Operating lease right-of-use assets - non cash | 3,979 |
Deferred income tax benefit | (10,329) | (5,034)
Changes in operating assets and liabilities, exclusive of effects of acquired companies: |  |
Accounts receivable | (35,544) | (31,393)
Income taxes | 4,553 | (1,942)
Prepaid expenses and other current assets | (7,630) | 983
Accounts payable | 1,548 | (4,729)
Operating lease liabilities | (4,530) |
Accrued liabilities | (1,379) | 1,523
Deferred revenue | 27,206 | 20,442
Net cash provided by operating activities | 178,527 | 179,353
Cash flows from investing activities: |  |
Additions to property and equipment | (28,833) | (23,460)
Purchase of marketable security investments | (27,322) | (92,638)
Proceeds from marketable security investments | 56,854 | 60,208
Investment in software | (3,540) | 0
Cost of acquisitions, net of cash acquired | (199,870) | (167,308)
(Increase) decrease in other | (493) | 857
Net cash used by investing activities | (203,204) | (222,341)
Cash flows from financing activities: |  |
Purchase of treasury shares | (17,786) | 0
Proceeds from exercise of stock options | 62,295 | 70,536
Contributions from employee stock purchase plan | 7,327 | 5,978
Net cash provided by financing activities | 51,836 | 76,514
Net increase in cash and cash equivalents | 27,159 | 33,526
Cash and cash equivalents at beginning of period | 134,279 | 185,926
Cash and cash equivalents at end of period | $ 161,438 | $ 219,452

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