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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 146,527 | $ 147,462 | $ 169,571
Adjustments to reconcile net income to cash provided by operations: |  |  |
Depreciation and amortization | 76,672 | 61,759 | 53,395
Share-based compensation expense | 59,967 | 52,740 | 37,348
Provision for losses and sales adjustments - accounts receivable | 1,636 | (569) | 2,031
Operating lease right-of-use assets - non cash | 5,397 |  |
Deferred income tax benefit | (6,088) | (5,069) | (33,664)
Changes in operating assets and liabilities, exclusive of effects of acquired companies: |  |  |
Accounts receivable | (65,738) | (50,916) | (33,091)
Income tax receivable | (1,925) | 6,642 | (8,444)
Prepaid expenses and other current assets | (8,976) | (588) | (6,958)
Accounts payable | 7,403 | (2,416) | 878
Operating lease liabilities | (6,113) |  |
Accrued liabilities | 1,516 | (2,445) | 6,050
Deferred revenue | 44,442 | 43,603 | 8,639
Net cash provided by operating activities | 254,720 | 250,203 | 195,755
Cash flows from investing activities: |  |  |
Additions to property and equipment | (37,236) | (27,424) | (43,057)
Purchase of marketable security investments | (54,742) | (115,625) | (59,779)
Proceeds from marketable security investments | 70,796 | 81,205 | 28,786
Capitalized software development costs | (4,804) | 0 | 0
Cost of acquisitions, net of cash acquired | (218,734) | (178,093) | (11,344)
(Increase) decrease in other | (295) | 1,682 | (1)
Net cash used by investing activities | (245,015) | (238,255) | (85,395)
Cash flows from financing activities: |  |  |
Decrease in net borrowings on revolving line of credit | 0 | 0 | (10,000)
Purchase of treasury shares | (17,786) | (146,553) | (7,474)
Proceeds from exercise of stock options | 96,908 | 74,907 | 49,845
Contributions from employee stock purchase plan | 9,576 | 8,051 | 7,044
Net cash provided (used) by financing activities | 88,698 | (63,595) | 39,415
Net increase (decrease) in cash and cash equivalents | 98,403 | (51,647) | 149,775
Cash and cash equivalents at beginning of period | 134,279 | 185,926 | 36,151
Cash and cash equivalents at end of period | $ 232,682 | $ 134,279 | $ 185,926

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