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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Significant Accounting Policies [Abstract]

Schedule of graduation fund liability

		Year Ended December 31,
		2014				2015
Balance at beginning of year		$	1,898			$	9,706
Revenue deferred			8,507				17,882
Benefit redeemed			(699	)			(6,651	)
Balance at end of year		$	9,706			$	20,937

Schedule of tuition receivable and allowance for doubtful accounts

		2014						2015
Tuition receivable		$	25,777					$	28,543
Allowance for doubtful accounts			(8,835	)					(10,024	)
Tuition receivable, net		$	16,942					$	18,519

Schedule of allowance for doubtful accounts

		2013						2014						2015
Beginning allowance for doubtful accounts		$	6,596					$	10,303					$	8,835
Additions charged to expense			22,225						16,947						13,067
Write-offs, net of recoveries			(18,518	)					(18,415	)					(11,878	)
Ending allowance for doubtful accounts		$	10,303					$	8,835					$	10,024

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

		2013				2014				2015
Weighted average shares outstanding used to compute basic earnings per share		10,584				10,561				10,588
Incremental shares issuable upon the assumed exercise of stock options		—				6				6
Unvested restricted stock and restricted stock units		40				83				146
Shares used to compute diluted earnings per share		10,624				10,650				10,740