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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 170,851 | $ 164,413 | $ 71,176
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 34,930 | 31,454 | 23,743
Amortization of intangibles | 2,415 | 3,494 | 4,359
Loss on disposal of property and equipment | 1,371 | 3,105 | 525
Stock-based compensation expense | 22,364 | 37,609 | 30,912
Amortization of premium on marketable securities | 3,292 | 1,590 | 705
Deferred income taxes | (2,566) | (13,240) | (592)
Increase (decrease) in accounts receivable allowance for credit losses | 690 | 18 | (336)
Change in operating assets and liabilities: |  |  |
Accounts receivable | 19,867 | (5,501) | (11,300)
Inventories | (36,154) | 3,612 | (12,498)
Prepaid expenses and other assets | 7,343 | 4,326 | 9,153
Accounts payable | (3,836) | 4,067 | 5,697
Taxes payable and accrued liabilities | (5,224) | (4,079) | 4,095
Net cash provided by operating activities | 215,343 | 230,868 | 125,639
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property and equipment | (39,211) | (47,272) | (70,598)
Proceeds from sale of property and equipment | 1,202 | 35 | 651
Purchases of marketable securities | (55,820) | (554,018) | (109,703)
Proceeds from sales and maturities of marketable securities | 172,165 | 368,457 | 151,385
Net cash provided by (used in) investing activities | 78,336 | (232,798) | (28,265)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Issuance of common stock under employee stock plans | 6,162 | 7,710 | 10,527
Repurchase of common stock | (311,094) | (73,938) | (2,636)
Payments of dividends to stockholders | (41,492) | (32,599) | (25,081)
Net cash used in financing activities | (346,424) | (98,827) | (17,190)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (52,745) | (100,757) | 80,184
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 158,117 | 258,874 | 178,690
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 105,372 | 158,117 | 258,874
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Unpaid property and equipment | 1,082 | 10,879 | 5,937
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Cash paid (received) for income taxes, net | $ 17,880 | $ 25,644 | $ (1,973)

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