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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities    
Net income $ 179,160 $ 106,330
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 105,423 96,108
Amortization of operating lease assets 77,438 0
Deferred income tax (benefit) provision (6,349) 16,948
Impairment, closure costs, and asset disposals 4,944 50,181
Bad debt allowance 85 106
Stock-based compensation expense 40,321 23,645
Other (2,588) (1,228)
Changes in operating assets and liabilities:    
Accounts receivable 18,275 16,621
Inventory 421 (1,007)
Prepaid expenses and other current assets (13,617) (19,490)
Other assets 2,907 3,776
Accounts payable (10,319) 14,451
Accrued payroll and benefits (16,526) 15,400
Accrued liabilities 7,659 7,100
Unearned revenue (8,681) (18,516)
Income tax payable/receivable (4,593) (23,003)
Deferred rent 0 11,455
Operating lease liabilities (74,346) 0
Other long-term liabilities 901 (3,459)
Net cash provided by operating activities 300,515 295,418
Investing activities    
Purchases of leasehold improvements, property and equipment (142,002) (128,505)
Purchases of investments (208,253) (208,294)
Maturities of investments 220,000 185,000
Net cash used in investing activities (130,255) (151,799)
Financing activities    
Acquisition of treasury stock (111,542) (97,528)
Tax withholding on share-based compensation awards (10,398) (4,273)
Stock plan transactions and other financing activities (510) (55)
Net cash used in financing activities (122,450) (101,856)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 494 (715)
Net change in cash, cash equivalents, and restricted cash 48,304 41,048
Cash, cash equivalents and restricted cash at beginning of period 280,152 214,170
Cash, cash equivalents and restricted cash at end of period 328,456 255,218
Supplemental disclosures of cash flow information    
Income taxes paid 69,075 64,184
Purchases of leasehold improvements, property, and equipment accrued in accounts payable and accrued liabilities 27,119 26,154
Acquisition of treasury stock accrued in accounts payable and accrued liabilities $ 1,900 $ 635