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Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2018
Significant 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, 2017 and 2018 (in thousands):
|  | For the three months ended
|  | March 31,
|  | 2017 |  | 2018
Cash and cash equivalents |  | $ | 147,099 |  | $ | 165,867
Restricted cash included in other current assets |  |  | — |  |  | 8
Restricted cash included in other long-term assets |  |  | 500 |  |  | 500
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows |  | $ | 147,599 |  | $ | 166,375
Schedule of tuition receivable and allowance for doubtful accounts |
|  | December 31, 2017 |  | March 31, 2018 |
Tuition receivable |  | $ | 35,809 |  | $ | 38,772 |
Allowance for doubtful accounts |  |  | (12,687) |  |  | (13,775) |
Tuition receivable, net |  | $ | 23,122 |  | $ | 24,997 |
Schedule of allowance for doubtful accounts |
|  | For the three months ended |
|  | March 31, |
|  | 2017 |  | 2018 |
Allowance for doubtful accounts, beginning of period |  | $ | 10,201 |  | $ | 12,687 |
Additions charged to expense |  |  | 4,382 |  |  | 6,391 |
Write-offs, net of recoveries |  |  | (3,763) |  |  | (5,303) |
Allowance for doubtful accounts, end of period |  | $ | 10,820 |  | $ | 13,775 |
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share |
|  | For the three months ended |
|  | March 31, |
|  | 2017 |  | 2018 |
Weighted average shares outstanding used to compute basic earnings per share |  | 10,630 |  | 10,745 |
Incremental shares issuable upon the assumed exercise of stock options |  | 35 |  | 45 |
Unvested restricted stock and restricted stock units |  | 456 |  | 521 |
Shares used to compute diluted earnings per share |  | 11,121 |  | 11,311 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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