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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2015
Significant Accounting Policies [Abstract]  
Schedule of graduation fund liability

 

Balance at December 31, 2014 $9,706 
Revenue deferred  3,603 
Benefit redeemed  (634)
Balance at March 31, 2015 $12,675 
Schedule of tuition receivable and allowance for doubtful accounts

 

  December 31,
2014		  March 31,
2015		 
Tuition receivable $25,777  $23,650 
Allowance for doubtful accounts  (8,835)  (8,688)
Tuition receivable, net $16,942  $14,962 
Schedule of allowance for doubtful accounts
 March 31, 
  2014  2015 
Allowance for doubtful accounts, beginning of period $10,303  $8,835 

Additions charged to expense

  4,993   3,470 
Write-offs, net of recoveries  (4,454)  (3,617)
Allowance for doubtful accounts, end of period $10,842  $8,688 
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share

  For the three months ended March 31, 
  2014  2015 
Weighted average shares outstanding used to compute basic earnings per share  10,529   10,579 
Incremental shares issuable upon the assumed exercise of stock options  —   19 
Unvested restricted stock and restricted stock units  52   140 
Shares used to compute diluted earnings per share  10,581   10,738