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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 | $ 95,867 | $ 109,637 | $ 124,264
Adjustments to reconcile net income to net |  |  |
Asset impairment | 2,994 |  | 612
Depreciation and amortization expense | 19,734 | 16,766 | 14,786
Bad debt expense | 41,574 | 44,344 | 47,556
Compensation expense related to share-based awards | 8,751 | 14,972 | 13,379
Deferred income taxes | (720) | 15,330 | 20,353
Changes in operating assets and liabilities: |  |  |
Student receivables, gross | 6,380 | 6,631 | 7,092
Allowance for credit losses | (38,992) | (47,417) | (39,546)
Receivables, other | (1,670) | 5,396 | (99)
Inventories, prepaid expenses, and other current assets | 2,640 | 3,285 | 3,031
Other non-current assets | 843 | 72 | 151
Accounts payable | 1,922 | (2,744) | 374
Accrued expenses and other non-current liabilities | 22,332 | (3,404) | (11,135)
Deferred revenue | (11,767) | 30,724 | 5,138
Right of use asset and lease liability | (1,702) | (2,476) | (6,000)
Net cash provided by operating activities | 148,186 | 191,116 | 179,956
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of available-for-sale investments | (492,100) | (269,739) | (403,673)
Sales of available-for-sale investments | 262,277 | 391,659 | 287,249
Purchases of property and equipment | (12,620) | (10,453) | (9,768)
Business acquisitions, net of cash acquired | (84,308) | (57,143) | (39,819)
Other |  |  | 103
Net cash (used in) provided by investing activities | (326,751) | 54,324 | (165,908)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Purchase of treasury stock | (23,117) | (25,296) | (17,862)
Issuance of common stock | 1,197 | 861 | 5,723
Payments of employee tax associated with stock compensation | (1,612) | (5,511) | (912)
Release of cash held in escrow | (4,197) |  |
Net cash used in financing activities | (27,729) | (29,946) | (13,051)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | (206,294) | 215,494 | 997
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the year | 325,178 | 109,684 | 108,687
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the year | 118,884 | 325,178 | 109,684
Supplemental Cash Flow Information: |  |  |
Income taxes paid | 28,940 | 23,224 | 611
Supplemental Non-Cash Disclosures: |  |  |
Amount placed in escrow to secure indemnification obligations from business acquisitions | 8,500 | 1,210 | 4,000
Non-cash additions to property and equipment | $ (1,953) | 2,287 | 52
Right of use assets obtained in exchange for lease liabilities |  | $ 727 | $ 552

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