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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash Flows from Operating Activities: |  |
Net income | $ 325,944 | $ 406,895
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 54,633 | 50,434
Impairment charges | 2,346 | 3,795
Provision for credit losses | 3,358 | 768
Deferred income taxes | (23,517) | 4,193
Share-based compensation expense | 23,543 | 18,512
Other | 1,200 | 1,300
Changes in assets and liabilities: |  |
Accounts receivable | (53,794) | (50,721)
Inventories | (49,349) | (20,412)
Other assets and liabilities | (94,729) | (55,162)
Accounts payable | (6,735) | 3,812
Deferred revenue | (2,344) | (5,037)
Net cash provided by operating activities | 180,556 | 358,377
Cash Flows from Investing Activities: |  |
Purchases of property and equipment | (61,924) | (42,744)
Acquisition of intangible assets | (10,000) | 0
Equity investment | (25,000) | 0
Acquisitions of a business, net of cash acquired | 0 | (156,506)
Net cash used by investing activities | (96,924) | (199,250)
Cash Flows from Financing Activities: |  |
Borrowings under revolving credit facility, net | 537,500 | 0
Payment of senior debt | (75,000) | 0
Payments of acquisition-related contingent consideration and holdbacks | (2,816) | (1,500)
Repurchases of common stock, net | (573,060) | (320,787)
Proceeds from exercises of stock options and employee stock purchase plans | 18,379 | 27,371
Shares withheld for statutory tax withholding payments on restricted stock | (10,390) | (14,952)
Net cash used by financing activities | (105,387) | (309,868)
Net effect of changes in exchange rates on cash | (8,337) | (1,053)
Net decrease in cash and cash equivalents | (30,092) | (151,794)
Cash and cash equivalents at beginning of period | 144,454 | 383,928
Cash and cash equivalents at end of period | 114,362 | 232,134
Supplemental Cash Flow Information: |  |
Cash paid for income taxes | 128,325 | 81,923
Unpaid property and equipment, reflected in accounts payable and accrued liabilities | $ 10,340 | $ 9,676

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