Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities
Net income	$ 84,563	$ 179,160
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	118,398	105,423
Amortization of operating lease assets	88,139	77,438
Deferred income tax provision	55,122	(6,349)
Impairment, closure costs, and asset disposals	13,747	4,944
Provision for credit losses	82	85
Stock-based compensation expense	40,762	40,321
Other	1,670	(2,588)
Changes in operating assets and liabilities:
Accounts receivable	22,598	18,275
Inventory	2,029	421
Prepaid expenses and other current assets	(6,250)	(13,617)
Other assets	(8,574)	2,907
Accounts payable	40,530	(10,319)
Accrued payroll and benefits	3,264	(16,526)
Accrued liabilities	(8,120)	7,659
Unearned revenue	(4,027)	(8,681)
Income tax payable/receivable	(70,119)	(4,593)
Operating lease liabilities	(69,468)	(74,346)
Other long-term liabilities	587	901
Net cash provided by operating activities	304,933	300,515
Investing activities
Purchases of leasehold improvements, property and equipment	(165,455)	(142,002)
Purchases of investments	(101,104)	(208,253)
Maturities of investments	198,578	220,000
Acquisitions of equity method investments	(7,525)	0
Net cash used in investing activities	(75,506)	(130,255)
Financing activities
Acquisition of treasury stock	(54,401)	(111,542)
Tax withholding on stock-based compensation awards	(47,947)	(10,398)
Other financing activities	(1,855)	(510)
Net cash used in financing activities	(104,203)	(122,450)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(104)	494
Net change in cash, cash equivalents, and restricted cash	125,120	48,304
Cash, cash equivalents, and restricted cash at beginning of period	508,481	280,152
Cash, cash equivalents, and restricted cash at end of period	633,601	328,456
Supplemental disclosures of cash flow information
Income taxes paid	657	69,075
Purchases of leasehold improvements, property, and equipment accrued in accounts payable and accrued liabilities	41,504	27,119
Acquisition of treasury stock accrued in accounts payable and accrued liabilities	$ 0	$ 1,900