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Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Accounting Policies [Abstract] |
Schedule of cash, cash equivalents, and restricted cash | The following table illustrates the reconciliation of cash, cash equivalents, and restricted cash shown in the unaudited condensed consolidated statements of cash flows as of March 31, 2020 and 2021 (in thousands):
| As of March 31,
| 2020 |  | 2021
Cash and cash equivalents | $ | 442,845 |  |  | $ | 238,290 |
Restricted cash included in other current assets | 850 |  |  | 13,249 |
Restricted cash included in other assets | 500 |  |  | 500 |
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows | $ | 444,195 |  |  | $ | 252,039 |
Schedule of tuition receivable and allowance for credit losses | The Company’s tuition receivable and allowance for credit losses were as follows as of December 31, 2020 and March 31, 2021 (in thousands):
| December 31, 2020 |  | March 31, 2021
Tuition receivable | $ | 99,942 |  |  | $ | 112,648 |
Allowance for credit losses | (49,773) |  |  | (49,179) |
Tuition receivable, net | $ | 50,169 |  |  | $ | 63,469 |
Schedule of allowance for credit losses | The following table illustrates changes in the Company’s allowance for credit losses for the three months ended March 31, 2020 and 2021 (in thousands).
| For the three months ended March 31,
| 2020 |  | 2021
Allowance for credit losses, beginning of period | $ | 30,931 |  |  | $ | 49,773 |
Impact of adopting ASC 326 | 4,571 |  |  | — |
Additions charged to expense | 11,171 |  |  | 10,822 |
Write-offs, net of recoveries | (8,579) |  |  | (11,416) |
Allowance for credit losses, end of period | $ | 38,094 |  |  | $ | 49,179 |
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share | Set forth below is a reconciliation of shares used to calculate basic and diluted earnings per share for the three months ended March 31, 2020 and 2021 (in thousands):
| For the three months ended March 31,
| 2020 |  | 2021
Weighted average shares outstanding used to compute basic earnings per share | 21,810 |  |  | 23,974 |
Incremental shares issuable upon the assumed exercise of stock options | 21 |  |  | 7 |
Unvested restricted stock and restricted stock units | 240 |  |  | 172 |
Shares used to compute diluted earnings per share | 22,071 |  |  | 24,153 |
Anti-dilutive shares excluded from the diluted earnings per share calculation | 3 |  |  | 118 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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