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Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2017 and 2018 (in thousands):


	For the six months ended
	June 30,
	2017		2018
Cash and cash equivalents	$	147,867	$	171,600
Restricted cash included in other current assets		15		—
Restricted cash included in other long-term assets		500		500
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	148,382	$	172,100

Schedule of tuition receivable and allowance for doubtful accounts


	December 31, 2017		June 30, 2018
Tuition receivable	$	35,809	$	40,643
Allowance for doubtful accounts		(12,687)		(15,048)
Tuition receivable, net	$	23,122	$	25,595

Schedule of allowance for doubtful accounts


	For the three months ended				For the six months ended
	June 30,				June 30,
	2017		2018		2017		2018
Allowance for doubtful accounts, beginning of period	$	10,820	$	13,775	$	10,201	$	12,687
Additions charged to expense		5,090		6,596		9,472		12,987
Write-offs, net of recoveries		(4,150)		(5,323)		(7,913)		(10,626)
Allowance for doubtful accounts, end of period	$	11,760	$	15,048	$	11,760	$	15,048

Schedule of reconciliation of shares used to calculate basic and diluted earnings per share


	For the three months ended		For the six months ended
	June 30,		June 30,
	2017	2018	2017	2018
Weighted average shares outstanding used to compute basic earnings per share	10,680	10,879	10,655	10,812
Incremental shares issuable upon the assumed exercise of stock options	41	51	38	48
Unvested restricted stock and restricted stock units	469	450	462	486
Shares used to compute diluted earnings per share	11,190	11,380	11,155	11,346