Condensed Consolidated Statement of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities
Net income	$ 97,039	$ 84,308
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,999	33,787
Deferred income tax (benefit) provision	8,701	(7,367)
Loss on disposal of assets	3,038	2,781
Bad debt allowance	3	(72)
Stock-based compensation	21,978	11,689
Excess tax benefit on stock-based compensation	(29,673)	(3,340)
Other	2,479	(109)
Changes in operating assets and liabilities:
Accounts receivable	(524)	1,048
Inventory	(1,347)	(744)
Prepaid expenses and other current assets	(15,260)	(4,025)
Other assets	64	(534)
Accounts payable	6,369	5,326
Accrued liabilities	(12,203)	(5,749)
Income tax receivable	47,067	2,514
Deferred rent	7,919	7,724
Other long-term liabilities	2,067	1,719
Net cash provided by operating activities	174,716	128,956
Investing activities
Purchases of leasehold improvements, property and equipment	(57,681)	(41,653)
Acquisition of interests in equity method investment	(586)	0
Purchases of investments	(89,702)	(80,000)
Maturities of investments	90,007	25,000
Net cash used in investing activities	(57,962)	(96,653)
Financing activities
Acquisition of treasury stock	(22,484)	(58,583)
Proceeds from option exercises	457	5,459
Excess tax benefit on stock-based compensation	29,673	3,340
Payments on deemed landlord financing	(58)	(43)
Net Cash provided by (used in) financing activities	7,588	(49,827)
Effect of exchange rate changes on cash and cash equivalents	621	0
Net change in cash and cash equivalents	124,963	(17,524)
Cash and cash equivalents at beginning of period	224,838	219,566
Cash and cash equivalents at end of period	349,801	202,042
Supplemental disclosures of non-cash information
Increase (decrease) in purchases of leasehold improvements, property and equipment accrued in accounts payable	$ 180	$ (345)