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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities: |  |  |
Net income | $ 582,131 | $ 427,792 | $ 377,047
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 95,998 | 88,011 | 83,178
Impairment charge | 2,501 | 968 | 2,629
Provision for uncollectible accounts | 4,946 | 662 | 1,609
(Benefit of) provision for deferred income taxes | (38,082) | 6,162 | 1,209
Share-based compensation expense | 30,951 | 39,278 | 25,157
Other | 1,379 | 1,254 | 895
Changes in assets and liabilities: |  |  |
Accounts receivable | (60,722) | (22,472) | (18,401)
Inventories | (18,885) | (37,306) | (25,623)
Accounts payable | 981 | 1,957 | (166)
Deferred revenue | (13,373) | (12,360) | (7,719)
Other assets and liabilities | 60,238 | (34,788) | (39,731)
Net cash provided by operating activities | 648,063 | 459,158 | 400,084
Cash Flows from Investing Activities: |  |  |
Purchases of property and equipment | (106,958) | (154,969) | (115,751)
Purchases of marketable securities | 0 | 0 | (87)
Proceeds from the sale and maturities of marketable securities | 0 | 0 | 284,125
Acquisitions of intangible assets and equity investments | (918) | (255) | (7,185)
Acquisitions of businesses, net of cash acquired | (1,500) | (50,304) | (22,500)
Net cash (used) provided by investing activities | (109,376) | (205,528) | 138,602
Cash Flows from Financing Activities: |  |  |
Repayment on revolving credit facilities, net | (289,625) | (110,275) | (256,040)
Issuance of senior notes | 200,000 | 100,000 | 0
Debt issuance costs | (5,025) | (154) | 0
Repurchases of common stock, net | (182,815) | (301,658) | (369,319)
Proceeds from exercises of stock options and employee stock purchase plans | 51,328 | 36,106 | 38,201
Payment of acquisition-related contingent consideration | (1,676) | (2,375) | (1,266)
Shares withheld for statutory tax withholding on restricted stock | (20,603) | (8,053) | (9,375)
Net cash used by financing activities | (248,416) | (286,409) | (597,799)
Net effect of changes in exchange rates on cash | 3,331 | (689) | (4,768)
Net increase (decrease) in cash and cash equivalents | 293,602 | (33,468) | (63,881)
Cash and cash equivalents at beginning of period | 90,326 | 123,794 | 187,675
Cash and cash equivalents at end of period | $ 383,928 | $ 90,326 | $ 123,794

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