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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Significant Accounting Policies [Abstract]  
Schedule of graduation fund liability
 
Balance at December 31, 2013
           $1,898  
Revenue deferred
             8,507  
Benefit redeemed
             (699)  
Balance at December 31, 2014
           $9,706  
Schedule of tuition receivable and allowance for doubtful accounts
 
     December 31,   
($ in thousands)
     2013   2014
Tuition receivable
           $26,145       $25,777  
Allowance for doubtful accounts
             (10,303)         (8,835)  
Tuition receivable, net
           $15,842       $16,942  
 
Schedule of allowance for doubtful accounts
 
     Year Ended December 31,   
($ in thousands)
     2012   2013   2014
Beginning allowance for doubtful accounts
           $7,279       $6,596       $10,303  
Additions charged to expense
             23,728         22,225         16,947  
Write-offs, net of recoveries
             (24,411)         (18,518)         (18,415)  
Ending allowance for doubtful accounts
           $6,596       $10,303       $8,835  
 
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share
 
     2012   2013   2014
Weighted average shares outstanding used to compute basic earnings per share
             11,390         10,584         10,561  
Incremental shares issuable upon the assumed exercise of stock options
             —          —          6   
Unvested restricted stock and restricted stock units
             50          40          83   
Shares used to compute diluted earnings per share
             11,440         10,624         10,650