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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows provided by operating activities:    
Net income $ 135,063 $ 100,535
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 9,562 9,034
Provision for bad debts 13,351 12,812
Depreciation and amortization 40,467 32,744
Deferred income taxes 3,813 2,132
Other 1,751 917
Changes in assets and liabilities:    
Accounts receivable (15,595) (14,876)
Prepaid expenses and other (3,016) (2,173)
Accounts payable 4,007 (3,756)
Accrued liabilities and employee related liabilities 6,710 11,127
Income taxes receivable/payable 8,156 5,315
Deferred rent (271) (790)
Deferred revenue 75,699 66,818
Student deposits (9,770) (6,574)
Net cash provided by operating activities 269,927 213,265
Cash flows used in investing activities:    
Capital expenditures (75,604) (157,584)
Purchases of land, building and golf course improvements related to off-site development (10,152) (41,876)
Proceeds received from note receivable   501
Return of equity method investment 685 1,749
Purchases of investments (76,630) (32,097)
Proceeds from sale or maturity of investments 49,617 65,807
Net cash used in investing activities (112,084) (163,500)
Cash flows used in financing activities:    
Principal payments on notes payable and capital lease obligations (5,102) (5,527)
Debt issuance costs   (194)
Net borrowings from revolving line of credit (25,000) 12,000
Repurchase of common shares including shares withheld in lieu of income taxes (9,657) (20,009)
Net proceeds from exercise of stock options 6,755 10,016
Net cash used in financing activities (33,004) (3,714)
Net increase in cash and cash equivalents and restricted cash 124,839 46,051
Cash and cash equivalents and restricted cash, beginning of period 130,907 98,420
Cash and cash equivalents and restricted cash, end of period 255,746 144,471
Supplemental disclosure of cash flow information    
Cash paid for interest 1,633 791
Cash paid for income taxes 45,413 50,826
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable $ 6,437 10,735
Tax benefit of Spirit warrant intangible   190
Shortfall tax expense from share-based compensation   $ 264