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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |
Net income | $ 368,837 | $ 293,814 | $ 190,993
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred income taxes | 76,432 | 60,420 | 41,875
Depreciation and amortization | 13,832 | 13,840 | 13,874
Stock-based compensation | 2,017 | 1,698 | 2,056
Amortization of debt discount and issuance costs | 9,136 | 8,397 | 7,799
Loss on write-off of property and equipment | 0 | 0 | 104
Loss on extinguishment of debt | 0 | 0 | 216
Amortization of discount on short-term investments | 0 | (343) | (2,229)
Amortization of lease guarantee | 0 | (135) | (325)
Changes in fair values of equity and long-term investments, net | (89,309) | (50,277) | 0
Other non-cash items | (259) | 21 | 0
Changes in operating assets and liabilities: |  |  |
Receivables from collaborative arrangements | (16,780) | (14,504) | 3,859
Prepaid expenses and other current assets | 203 | (678) | (113)
Other assets | 0 | 0 | 27
Accounts payable | (39) | 56 | (1)
Accrued personnel-related expenses and other accrued liabilities | (257) | 804 | (439)
Accrued interest payable | 0 | 0 | (112)
Other long-term liabilities | 0 | 0 | (126)
Net cash provided by operating activities | 363,813 | 313,113 | 257,458
Cash flows from investing activities |  |  |
Maturities of marketable securities | 0 | 86,000 | 213,924
Purchases of marketable securities | 0 | (12,943) | (231,915)
Purchases of equity and long term investments | (66,278) | (87,981) | 0
Purchases and sales of marketable securities and other investments managed by ISP Fund LP, net | (190,970) | (14,877) | 0
Sale of equity investments managed by ISP FUND LP | 21,440 |  | 0
Purchase and sale of other investments managed by ISP FUND LP | 279,530 |  | 0
Purchases of property and equipment | 0 | (13) | (12)
Net cash provided by (used in) investing activities | 43,722 | (314,937) | (18,003)
Cash flows from financing activities |  |  |
Repurchase of common stock | (394,149) | 0 | 0
Distributions to noncontrolling interest | (59,457) | (30,474) | (10,553)
Repurchase of shares to satisfy tax withholding | (60) | (92) | (89)
Payments of principal on senior secured term loans | 0 | 0 | (13,750)
Payments of cash dividends to stockholders | 0 | 0 | (11)
Proceeds from issuances of common stock, net | 1,169 | 436 | 627
Net proceeds from the issuance of variable interest entity's equity | 0 | 345 | 0
Net cash used in financing activities | (452,497) | (29,785) | (23,776)
Net increase (decrease) in cash and cash equivalents | (44,962) | (31,609) | 215,679
Cash and cash equivalents at beginning of period | 246,487 | 278,096 | 62,417
Cash and cash equivalents at end of period | 201,525 | 246,487 | 278,096
Supplemental disclosure of cash flow information |  |  |
Cash paid for interest | $ 9,933 | $ 9,933 | $ 10,974

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