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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 | $ 109,637 | $ 124,264 | $ 69,982
Adjustments to reconcile net income to net |  |  |
Asset impairment |  | 612 |
Depreciation and amortization expense | 16,766 | 14,786 | 9,145
Bad debt expense | 44,344 | 47,556 | 43,454
Compensation expense related to share-based awards | 14,972 | 13,379 | 9,274
Loss on disposition of asset |  |  | 14
Deferred income taxes | 15,330 | 20,353 | 21,556
Changes in operating assets and liabilities: |  |  |
Student receivables, gross | 6,631 | 7,092 | (33,697)
Allowance for credit losses | (47,417) | (39,546) | (36,326)
Receivables, other | 5,396 | (99) | 1,189
Inventories, prepaid expenses, and other current assets | 3,285 | 3,031 | (1,180)
Other non-current assets | 72 | 151 | (489)
Accounts payable | (2,744) | 374 | 2,320
Accrued expenses and other non-current liabilities | (3,404) | (11,135) | 5,066
Deferred revenue | 30,724 | 5,138 | (7,704)
Right of use asset and lease liability | (2,476) | (6,000) | (9,519)
Net cash provided by operating activities | 191,116 | 179,956 | 73,085
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of available-for-sale investments | (269,739) | (403,673) | (449,367)
Sales of available-for-sale investments | 391,659 | 287,249 | 462,325
Purchases of property and equipment | (10,453) | (9,768) | (5,174)
Business acquisitions, net of cash acquired | (57,143) | (39,819) |
Other |  | 103 | (85)
Net cash provided by (used in) investing activities | 54,324 | (165,908) | 7,699
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Purchase of treasury stock | (25,296) | (17,862) | (3,875)
Issuance of common stock | 861 | 5,723 | 1,774
Payments of employee tax associated with stock compensation | (5,511) | (912) | (2,740)
Net cash used in financing activities | (29,946) | (13,051) | (4,841)
EFFECT OF FOREIGN CURRENCY EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS AND RESTRICTED CASH: |  |  | 13
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | 215,494 | 997 | 75,956
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the year | 109,684 | 108,687 | 32,731
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the year | 325,178 | 109,684 | 108,687
Supplemental Cash Flow Information: |  |  |
Income taxes paid | 23,224 | 611 | 46
Supplemental Non-Cash Disclosures: |  |  |
Amount placed in escrow to secure indemnification obligations from business acquisitions | 1,210 | 4,000 |
Non-cash additions to property and equipment | 2,287 | 52 | $ 38
Right of use assets obtained in exchange for lease liabilities | $ 727 | $ 552 |

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