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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net income $ 315,075 $ 84,563
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 125,204 118,398
Amortization of operating lease assets 105,485 88,139
Deferred income tax provision (15,884) 55,122
Impairment, closure costs, and asset disposals 8,235 13,747
Provision for credit losses (220) 82
Stock-based compensation expense 102,680 40,762
Other 2,467 1,670
Changes in operating assets and liabilities:    
Accounts receivable 37,286 22,598
Inventory 1,309 2,029
Prepaid expenses and other current assets (18,186) (6,250)
Other assets 117 (8,574)
Accounts payable 12,525 40,530
Accrued payroll and benefits 21,068 3,264
Accrued liabilities (20,102) (8,120)
Unearned revenue (11,487) (4,027)
Income tax payable/receivable (1,851) (70,119)
Operating lease liabilities (101,818) (69,468)
Other long-term liabilities 955 587
Net cash provided by operating activities 562,858 304,933
Investing activities    
Purchases of leasehold improvements, property and equipment (212,123) (165,455)
Purchases of investments (190,920) (101,104)
Maturities of investments 162,045 198,578
Proceeds from sale of equipment 2,885 0
Acquisitions of equity method investments 0 (7,525)
Net cash used in investing activities (238,113) (75,506)
Financing activities    
Acquisition of treasury stock (203,151) (54,401)
Tax withholding on stock-based compensation awards (58,860) (47,947)
Other financing activities (2,208) (1,855)
Net cash used in financing activities (264,219) (104,203)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (216) (104)
Net change in cash, cash equivalents, and restricted cash 60,310 125,120
Cash, cash equivalents, and restricted cash at beginning of period 635,836 508,481
Cash, cash equivalents, and restricted cash at end of period 696,146 633,601
Supplemental disclosures of cash flow information    
Income taxes paid 108,247 657
Purchases of leasehold improvements, property, and equipment accrued in accounts payable and accrued liabilities 50,403 41,504
Acquisition of treasury stock accrued in accounts payable and accrued liabilities $ 3,372 $ 0