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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows provided by operating activities:    
Net income $ 119,719 $ 95,759
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 6,734 6,229
Provision for bad debts 8,669 7,830
Depreciation and amortization 27,971 26,856
Deferred income taxes 1,246 3,372
Other 1,018 214
Changes in assets and liabilities:    
Accounts receivable (7,784) (8,458)
Prepaid expenses and other (78) (1,719)
Accounts payable (1,373) (1,708)
Accrued liabilities and employee related liabilities 2,502 (439)
Income taxes receivable/payable (14,365) 1,042
Deferred rent (189) (222)
Deferred revenue 6,880 11,265
Student deposits (7,288) (6,361)
Net cash provided by operating activities 143,662 133,660
Cash flows used in investing activities:    
Capital expenditures (78,836) (50,491)
Purchases of land and building improvements related to off-site development (330) (9,374)
Purchases of investments (21,265) (52,181)
Proceeds from sale or maturity of investments 32,996 25,363
Net cash used in investing activities (67,435) (86,683)
Cash flows used in financing activities:    
Principal payments on notes payable and capital lease obligations (3,433) (3,400)
Net borrowings from revolving line of credit   (25,000)
Repurchase of common shares including shares withheld in lieu of income taxes (13,063) (9,657)
Net proceeds from exercise of stock options 1,768 5,895
Net cash used in financing activities (14,728) (32,162)
Reclassification of restricted cash to assets held for sale (87,875)  
Net (decrease) increase in cash and cash equivalents and restricted cash (26,376) 14,815
Cash and cash equivalents and restricted cash, beginning of period 248,008 130,907
Cash and cash equivalents and restricted cash, end of period 221,632 145,722
Supplemental disclosure of cash flow information    
Cash paid for interest 379 1,167
Cash paid for income taxes 44,234 31,718
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 14,361 $ 7,118
Reclassification of capitalized costs - adoption of ASC 606 9,015  
Reclassification of deferred revenue - adoption of ASC 606 7,451  
Reclassification of tax effect within accumulated other comprehensive income $ 156