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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Significant Accounting Policies [Abstract]

The table below presents activity in the Graduation Fund for the years ended December 31, 2016 and 2017 (in thousands):


	December 31,		December 31,
	2016		2017
Balance at beginning of period	$	20,937	$	29,499
Revenue deferred		20,766		25,360
Benefit redeemed		(12,204)		(17,459)
Balance at end of period	$	29,499	$	37,400

Schedule of tuition receivable and allowance for doubtful accounts

The Company’s tuition receivable and allowance for doubtful accounts were as follows as of December 31, 2016 and 2017 (in thousands):


	December 31, 2016		December 31, 2017
Tuition receivable	$	30,733	$	35,809
Allowance for doubtful accounts		(10,201)		(12,687)
Tuition receivable, net	$	20,532	$	23,122

Schedule of allowance for doubtful accounts

The following table illustrates changes in the Company’s allowance for doubtful accounts for each of the three years ended December 31, 2017 (in thousands):


	2015		2016		2017
Allowance for doubtful accounts, beginning of period	$	8,835	$	10,024	$	10,201
Additions charged to expense		13,067		16,503		21,751
Write-offs, net of recoveries		(11,878)		(16,326)		(19,265)
Allowance for doubtful accounts, end of period	$	10,024	$	10,201	$	12,687

Schedule of changes in goodwill

The following table presents changes in goodwill for the years ended December 31, 2016 and 2017 (in thousands):


	2016		2017
Balance as of the beginning of period	$	6,800	$	20,744
Acquisition (see Note 3)		14,242		—
Measurement period adjustments		(298)		—
Balance as of the end of period	$	20,744	$	20,744

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 each of the three years ended December 31, 2017 (in thousands):


	2015	2016	2017
Weighted average shares outstanding used to compute basic earnings per share	10,588	10,610	10,678
Incremental shares issuable upon the assumed exercise of stock options	6	5	39
Unvested restricted stock and restricted stock units	146	230	482
Shares used to compute diluted earnings per share	10,740	10,845	11,199