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Restatement of Consolidated Financial Statements (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Results of operations    
Net revenue$ 108,909$ 98,946$ 313,736$ 285,594
Costs and expenses:    
Instructional costs and services48,93345,717144,162133,409
Selling and promotional31,24828,10388,78983,955
General and administrative7,1456,60821,01518,888
Exit costs 27 232
Total costs and expenses88,24880,455254,888236,484
Operating income20,66118,49158,84849,110
Interest expense(170)(176)(306)(682)
Income before income taxes20,51118,34858,62048,559
Income tax expense7,6437,60623,39819,603
Net income12,86810,74235,22228,956
Earnings per share:    
Basic income per share(1)$ 0.29$ 0.23$ 0.79$ 0.63
Diluted income per share(1)$ 0.29$ 0.23$ 0.78$ 0.62
Basic44,30245,74644,84545,715
Diluted44,78746,35145,29346,413
Results of cash flows    
Net income12,86810,74235,22228,956
Provision for bad debts  27,90329,283
Deferred income taxes  10,185(9,461)
Changes in accounting receivables  26,25339,080
Net cash provided by operating activities  65,49180,534
Scenario, Previously Reported [Member]
    
Results of operations    
Net revenue 98,946 285,794
Costs and expenses:    
Instructional costs and services 42,070 120,472
Selling and promotional 28,103 83,955
General and administrative 6,608 18,888
Exit costs 27 232
Total costs and expenses 76,808 223,547
Operating income 22,138 62,247
Interest expense (143) (551)
Income before income taxes 21,995 61,696
Income tax expense 9,077 24,902
Net income 12,918 36,794
Earnings per share:    
Basic income per share(1) $ 0.28 $ 0.80
Diluted income per share(1) $ 0.28 $ 0.79
Basic 45,746 45,715
Diluted 46,351 46,413
Results of cash flows    
Net income 12,918 36,794
Provision for bad debts   16,347
Deferred income taxes   (4,163)
Changes in accounting receivables   (39,280)
Net cash provided by operating activities   80,534
Scenario Previously Restated [Member]
    
Results of operations    
Net revenue 98,946 285,594
Costs and expenses:    
Instructional costs and services 45,717 133,409
Selling and promotional 28,103 83,955
General and administrative 6,608 18,888
Exit costs 27 232
Total costs and expenses 80,455 236,484
Operating income 18,491 49,110
Interest expense (143) (551)
Income before income taxes 18,348 48,559
Income tax expense 7,606 19,603
Net income 10,742 28,956
Earnings per share:    
Basic income per share(1) $ 0.23 $ 0.63
Diluted income per share(1) $ 0.23 $ 0.62
Basic 45,746 45,715
Diluted 46,351 46,413
Results of cash flows    
Net income 10,742 28,956
Provision for bad debts   29,283
Deferred income taxes   (9,461)
Changes in accounting receivables   (39,080)
Net cash provided by operating activities   $ 80,534