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Restatement of Consolidated Financial Statements (Tables)
9 Months Ended
Sep. 30, 2011
Restatement of Consolidated Financial Statements [Abstract] 
Results of operations
                                 
    Three Months Ended     Nine Months Ended  
    September 30, 2010     September 30, 2010  
    As Reported     As Restated     As Reported     As Restated  
Net revenue
  $ 98,946     $ 98,946     $ 285,794     $ 285,594  
Costs and expenses:
                               
Instructional costs and services
    42,070       45,717       120,472       133,409  
Selling and promotional
    28,103       28,103       83,955       83,955  
General and administrative
    6,608       6,608       18,888       18,888  
Exit costs
    27       27       232       232  
 
                       
Total costs and expenses
    76,808       80,455       223,547       236,484  
 
                       
Operating income
    22,138       18,491       62,247       49,110  
Net interest expense
    (143 )     (143 )     (551 )     (551 )
 
                       
Income before income taxes
    21,995       18,348       61,696       48,559  
Income tax expense
    9,077       7,606       24,902       19,603  
 
                       
Net income
  $ 12,918     $ 10,742     $ 36,794     $ 28,956  
 
                       
Earnings per share:
                               
Basic income per share(1)
  $ 0.28     $ 0.23     $ 0.80     $ 0.63  
 
                       
Diluted income per share(1)
  $ 0.28     $ 0.23     $ 0.79     $ 0.62  
 
                       
Basic weighted average shares outstanding
    45,746       45,746       45,715       45,715  
 
                       
Diluted weighted average shares outstanding
    46,351       46,351       46,413       46,413  
 
                       
     
(1)  
The sum of quarterly income per share may not equal annual income per share due to rounding.
Results of cash flows
                 
    Nine Months Ended  
    September 30, 2010  
    As Reported     As Restated  
Net income
  $ 36,794     $ 28,956  
Provision for bad debts
    16,347       29,283  
Deferred income taxes
    (4,163 )     (9,461 )
Changes in accounts receivable
    (39,280 )     (39,080 )
Net cash provided by operating activities
    80,534       80,534