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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows provided by operating activities:    
Net income $ 78,373 $ 62,554
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 7,412 7,668
Excess tax benefits from share-based compensation (7,232) (3,678)
Provision for bad debts 10,835 14,881
Depreciation and amortization 21,418 18,602
Prepaid royalty impairment 966  
Gain on proceeds received from note receivable   (3,646)
Deferred income taxes (137) 2,404
Other including fixed asset impairments 2,475  
Changes in assets and liabilities:    
Restricted cash and cash equivalents 5,567 6,249
Accounts receivable (11,907) (14,916)
Prepaid expenses and other (317) (5,854)
Due to/from related parties 17 (29)
Accounts payable (2,956) 1,859
Accrued liabilities and employee related liabilities (1,610) (3,753)
Income taxes receivable/payable 18,782 (4,055)
Deferred rent (2,736) (721)
Deferred revenue 44,092 29,889
Student deposits (6,300) (5,668)
Net cash provided by operating activities 156,742 101,786
Cash flows used in investing activities:    
Capital expenditures (141,217) (59,168)
Purchase of land and building related to off-site development   (11,209)
Purchases of investments (101,185) (101,040)
Proceeds from sale or maturity of investments 82,479 37,548
Restricted funds held for derivative collateral   140
Proceeds received from note receivable   29,187
Net cash used in investing activities (159,923) (104,542)
Cash flows provided by financing activities:    
Principal payments on notes payable and capital lease obligations (5,021) (5,024)
Repurchase of common shares including shares withheld in lieu of income taxes (5,338) (9,009)
Excess tax benefits from share-based compensation 7,232 3,678
Net proceeds from exercise of stock options 6,966 14,816
Net cash provided by financing activities 3,839 4,461
Net increase in cash and cash equivalents 658 1,705
Cash and cash equivalents, beginning of period 55,824 105,111
Cash and cash equivalents, end of period 56,482 106,816
Supplemental disclosure of cash flow information    
Cash paid for interest 1,327 1,592
Cash paid for income taxes 29,223 44,108
Cash received for income tax refunds 364 715
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 11,650 6,901
Tax benefit of Spirit warrant intangible 195 201
Shortfall tax expense from share-based compensation $ 14 $ 206