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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 | $ 46,670 | $ 55,087 | $ 86,268
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Loss on sale of marketable securities | 0 | 781 | 0
Gain on sale of property and equipment | (2,886) | (2,656) | 0
Amortization of deferred financing costs | 552 | 552 | 466
Amortization of investment discount/premium | 32 | 70 | 146
Depreciation and amortization | 63,124 | 103,416 | 109,154
Deferred income taxes | (8,667) | (7,710) | (13,431)
Stock-based compensation | 21,792 | 18,149 | 14,610
Impairment of right-of-use lease assets | 1,185 | 18,876 | 848
Changes in assets and liabilities: |  |  |
Tuition receivable, net | (12,558) | (196) | 19,659
Other assets | 3,584 | (6,964) | (32,326)
Accounts payable and accrued expenses | (4,339) | (6,700) | (22,685)
Income taxes payable and income taxes receivable | 7,580 | 1,196 | (4,020)
Contract liabilities | 18,960 | 13,995 | (10,095)
Other liabilities | (8,977) | (7,369) | (5,689)
Net cash provided by operating activities | 126,052 | 180,527 | 142,905
Cash flows from investing activities: |  |  |
Cash paid for acquisition, net of cash acquired | (800) | 0 | (628,759)
Purchases of property and equipment | (43,170) | (49,433) | (46,812)
Purchases of marketable securities | 0 | 0 | (1,863)
Proceeds from marketable securities | 6,420 | 9,300 | 36,192
Proceeds from sale of property and equipment | 6,525 | 8,331 | 0
Other investments | (335) | (1,292) | (950)
Net cash used in investing activities | (31,360) | (33,094) | (642,192)
Cash flows from financing activities: |  |  |
Net proceeds from issuance of common stock | 0 | 0 | 220,248
Proceeds from long-term debt | 0 | 0 | 145,630
Common dividends paid | (59,240) | (59,045) | (55,956)
Net payments for stock awards | (3,004) | (2,938) | (24,741)
Payments on long-term debt | (40,000) | 0 | (3,807)
Payment of deferred financing costs | 0 | 0 | (1,940)
Repurchase of common stock | (40,116) | (5,905) | (247)
Net cash provided by (used in) financing activities | (142,360) | (67,888) | 279,187
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | (4,090) | (2,353) | 1,623
Net increase (decrease) in cash, cash equivalents, and restricted cash | (51,758) | 77,192 | (218,477)
Cash, cash equivalents, and restricted cash - beginning of period | 279,212 | 202,020 | 420,497
Cash, cash equivalents, and restricted cash - end of period | 227,454 | 279,212 | 202,020
Noncash transactions: |  |  |
Non-cash additions to property and equipment | $ 1,718 | $ 9,308 | $ 4,079

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