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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Operating activities: |  |
Net income | $ 6,227 | $ 26,704
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Deferred taxes | 4,100 | 2,193
Depreciation of fixed assets and amortization of intangible assets | 38,656 | 40,897
Amortization of debt issuance costs | 1,628 | 2,053
Amortization of debt discount | 703 | 1,412
Loss on early extinguishment of debt | 16,926 | 0
Loss on disposal of fixed assets | 0 | 193
Stock-based compensation | 22,945 | 22,733
Changes in contingent consideration | (6,640) | (22,351)
Loss on investment | 11 | 108
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (683) | 5,213
Inventories, net | 3,933 | (2,038)
Prepaid expenses and other assets | (4,369) | (3,233)
Accounts payable | 9,683 | 5,258
Accrued expenses and income taxes payable | (30,771) | (19,038)
Other liabilities | 278 | 479
Net cash provided by operating activities | 62,627 | 60,583
Investing activities: |  |
Purchases of fixed assets | (9,969) | (19,403)
Purchases of available-for-sale investments | (69,509) | (187,641)
Sales of available-for-sale investments | 159,745 | 62,936
Payment of contingent consideration | 0 | (32,000)
Purchases of equity and debt investments | (6,758) | (12,750)
Net cash provided by (used in) investing activities | 73,509 | (188,858)
Financing activities: |  |
Proceeds from exercises of stock options | 1,913 | 21,881
Proceeds from shares issued under employee stock purchase plan | 1,673 | 1,821
Proceeds from Term loan A facility | 149,550 | 0
Debt extinguishment costs | (5,750) | 0
Payment of debt issuance and financing costs | (1,163) | 0
Net cash used in financing activities | (153,465) | (335,242)
Net decrease in cash and cash equivalents | (17,329) | (463,517)
Cash and cash equivalents, beginning of period | 104,139 | 585,578
Cash and cash equivalents, end of period | 86,810 | 122,061
Supplemental cash flow information: |  |
Cash paid for interest | 20,802 | 14,686
Cash paid for income taxes, net of refunds | 795 | 4,104
Non-cash investing and financing activities: |  |
Issuance of common stock from conversion of 2022 convertible senior notes | 0 | 3,040
Fixed assets included in accounts payable and accrued liabilities | 2,388 | 2,454
Convertible Senior Notes Due 2022 |  |
Financing activities: |  |
Repayment of 2024 convertible senior notes | 0 | (156,960)
Convertible Senior Notes Due 2024 |  |
Financing activities: |  |
Repayment of 2024 convertible senior notes | 0 | (192,609)
Term Loan B Facility |  |
Financing activities: |  |
Repayment of Term loan B facility | (296,875) | (9,375)
Term Loan A Facility |  |
Financing activities: |  |
Repayment of Term loan B facility | $ (2,813) | $ 0

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