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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 | $ 427,792 | $ 377,047 | $ 263,269
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 88,011 | 83,178 | 83,140
Impairment charge | 968 | 2,629 | 0
Provision for uncollectible accounts | 662 | 1,609 | 1,881
Benefit of (provision for) deferred income taxes | 6,162 | 1,209 | (7,918)
Share-based compensation expense | 39,278 | 25,157 | 23,517
Other | 1,254 | 895 | 1,007
Changes in assets and liabilities: |  |  |
Accounts receivable | (22,472) | (18,401) | (24,918)
Inventories | (37,306) | (25,623) | (19,062)
Accounts payable | 1,957 | (166) | 1,391
Deferred revenue | (12,360) | (7,719) | 3,551
Other assets and liabilities | (34,788) | (39,731) | 47,418
Net cash provided by operating activities | 459,158 | 400,084 | 373,276
Cash Flows from Investing Activities: |  |  |
Purchases of property and equipment | (154,969) | (115,751) | (74,384)
Purchases of marketable securities | 0 | (87) | (334,164)
Proceeds from the sale and maturities of marketable securities | 0 | 284,125 | 286,759
Acquisitions of intangible assets and equity investment | (255) | (7,185) | (2,320)
Acquisitions of businesses | (50,304) | (22,500) | (14,579)
Net cash (used) provided by investing activities | (205,528) | 138,602 | (138,688)
Cash Flows from Financing Activities: |  |  |
(Repayment) borrowings on revolving credit facilities, net | (110,275) | (256,040) | 44,000
Issuance of senior notes | 100,000 | 0 | 0
Debt issuance costs | (154) | 0 | 0
Repurchases of common stock, net | (301,658) | (369,319) | (282,565)
Proceeds from exercises of stock options and employee stock purchase plans | 36,106 | 38,201 | 38,622
Payment of acquisition-related contingent consideration | (2,375) | (1,266) | 0
Shares withheld for statutory tax withholding on restricted stock | (8,053) | (9,375) | (8,073)
Net cash used by financing activities | (286,409) | (597,799) | (208,016)
Net effect of changes in exchange rates on cash | (689) | (4,768) | 6,202
Net (decrease) increase in cash and cash equivalents | (33,468) | (63,881) | 32,774
Cash and cash equivalents at beginning of period | 123,794 | 187,675 | 154,901
Cash and cash equivalents at end of period | $ 90,326 | $ 123,794 | $ 187,675

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