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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net income | $ 69,791 | $ 46,670 | $ 55,087
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Loss on sale of marketable securities | 0 | 0 | 781
Gain on sale of property and equipment | (2,136) | (2,886) | (2,656)
Amortization of deferred financing costs | 557 | 552 | 552
Amortization of investment discount/premium | (65) | 32 | 70
Depreciation and amortization | 57,313 | 63,124 | 103,416
Deferred income taxes | (6,322) | (8,667) | (7,710)
Stock-based compensation | 19,772 | 21,792 | 18,149
Impairment of right-of-use lease assets | 5,135 | 1,185 | 18,876
Changes in assets and liabilities: |  |  |
Tuition receivable, net | (12,874) | (12,558) | (196)
Other assets | (7,631) | 3,584 | (6,964)
Accounts payable and accrued expenses | 552 | (4,339) | (6,700)
Income taxes payable and income taxes receivable | (4,688) | 7,580 | 1,196
Contract liabilities | 4,495 | 18,960 | 13,995
Other liabilities | (6,780) | (8,977) | (7,369)
Net cash provided by operating activities | 117,119 | 126,052 | 180,527
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (36,943) | (43,170) | (49,433)
Purchases of marketable securities | (26,905) | 0 | 0
Proceeds from marketable securities | 9,800 | 6,420 | 9,300
Proceeds from sale of property and equipment | 5,890 | 6,525 | 8,331
Proceeds from other investments | 457 | 0 | 0
Other investments | (314) | (335) | (1,292)
Cash paid for acquisition, net of cash acquired | (530) | (800) | 0
Net cash used in investing activities | (48,545) | (31,360) | (33,094)
Cash flows from financing activities: |  |  |
Common dividends paid | (58,780) | (59,240) | (59,045)
Payments on long-term debt | (40,000) | (40,000) | 0
Net payments for stock awards | (4,828) | (3,004) | (2,938)
Repurchase of common stock | (9,999) | (40,116) | (5,905)
Net cash used in financing activities | (113,607) | (142,360) | (67,888)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | (496) | (4,090) | (2,353)
Net increase (decrease) in cash, cash equivalents, and restricted cash | (45,529) | (51,758) | 77,192
Cash, cash equivalents, and restricted cash — beginning of period | 227,454 | 279,212 | 202,020
Cash, cash equivalents, and restricted cash — end of period | 181,925 | 227,454 | 279,212
Noncash transactions: |  |  |
Non-cash additions to property and equipment | $ 3,066 | $ 1,718 | $ 9,308

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