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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 | $ 337,248 | $ 291,370
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 65,422 | 62,574
Impairment charge | 0 | 2,629
Benefit of deferred income taxes | 2,403 | 12,850
Share-based compensation expense | 22,623 | 18,948
Other | 1,497 | 2,385
Changes in assets and liabilities: |  |
Accounts receivable | (24,451) | (33,041)
Inventories | (36,582) | (27,415)
Other assets and liabilities | (54,770) | (58,214)
Accounts payable | 1,181 | (1,336)
Deferred revenue | (10,826) | (6,314)
Net cash provided by operating activities | 303,745 | 264,436
Cash Flows from Investing Activities: |  |
Purchases of property and equipment | (109,058) | (82,642)
Purchase of marketable securities | 0 | (87)
Proceeds from the sale and maturities of marketable securities | 0 | 284,125
Acquisitions of intangible assets | (255) | (450)
Acquisition of a business | (304) | (22,500)
Net cash (used) provided by investing activities | (109,617) | 178,446
Cash Flows from Financing Activities: |  |
Repayments on revolving credit facilities, net | (169,532) | (240,500)
Issuance of senior notes | 100,000 | 0
Debt issuance costs | (154) | 0
Payment of acquisition-related contingent consideration | (2,255) | (1,266)
Repurchases of common stock, net | (160,969) | (263,712)
Proceeds from exercises of stock options and employee stock purchase plans | 28,739 | 34,595
Shares withheld for statutory tax withholding on restricted stock | (7,849) | (9,110)
Net cash used by financing activities | (212,020) | (479,993)
Net effect of changes in exchange rates on cash | (1,906) | (3,687)
Net decrease in cash and cash equivalents | (19,798) | (40,798)
Cash and cash equivalents at beginning of period | 123,794 | 187,675
Cash and cash equivalents at end of period | 103,996 | 146,877
Supplemental Cash Flow Information: |  |
Unpaid property and equipment, reflected in accounts payable and accrued liabilities | $ 19,196 | $ 10,239

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