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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities    
Net income $ 127,101 $ 76,388
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 63,122 58,374
Amortization of operating lease assets 49,269 42,961
Deferred income tax provision (13,482) 27,343
Impairment, closure costs, and asset disposals 4,937 8,805
Provision for credit losses (275) (90)
Stock-based compensation expense 55,390 17,395
Other 2,180 707
Changes in operating assets and liabilities:    
Accounts receivable 32,175 25,967
Inventory 2,148 2,734
Prepaid expenses and other current assets (8,756) (4,158)
Other assets (186) (5,133)
Accounts payable 19,446 20,245
Accrued payroll and benefits 18,188 5,839
Accrued liabilities (17,869) (9,389)
Unearned revenue (15,606) (15,924)
Income tax payable/receivable 38,640 (29,179)
Operating lease liabilities (50,902) (40,918)
Other long-term liabilities 453 104
Net cash provided by operating activities 305,973 182,071
Investing activities    
Purchases of leasehold improvements, property and equipment (86,619) (77,653)
Purchases of investments (90,477) (80,746)
Maturities of investments 60,593 99,037
Net cash used in investing activities (116,503) (59,362)
Financing activities    
Acquisition of treasury stock (57,229) (54,401)
Tax withholding on stock-based compensation awards (44,810) (47,630)
Other financing activities (221) (69)
Net cash used in financing activities (102,260) (102,100)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (407) (819)
Net change in cash, cash equivalents, and restricted cash 86,803 19,790
Cash, cash equivalents, and restricted cash at beginning of period 635,836 508,481
Cash, cash equivalents, and restricted cash at end of period 722,639 528,271
Supplemental disclosures of cash flow information    
Income taxes (refunded)   (14)
Income taxes paid 6,909  
Purchases of leasehold improvements, property, and equipment accrued in accounts payable and accrued liabilities 54,868 33,757
Acquisition of treasury stock accrued in accounts payable and accrued liabilities $ 3,997 $ 0