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Consolidated Statement Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities      
Net income $ 278,000 $ 214,945 $ 178,981
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 84,130 74,938 68,921
Deferred income tax provision (benefit) (18,057) 11,935 10,479
Loss on disposal of assets 5,027 5,806 6,296
Bad debt allowance 1,046 239 (151)
Stock-based compensation expense 64,276 41,382 21,381
Excess tax benefit on stock-based compensation (73,210) (38,786) (14,526)
Other 522 2,501  
Changes in operating assets and liabilities:      
Accounts receivable (9,438) (2,970) (743)
Inventory (2,180) (1,816) (1,481)
Prepaid expenses and other current assets (5,954) (5,399) (1,632)
Other assets (20,539) (7,350) (8,956)
Accounts payable 7,849 9,432 6,989
Accrued liabilities 21,307 17,451 16,607
Income tax payable/receivable 59,357 66,555 (13,209)
Deferred rent 23,765 19,624 17,261
Other long-term liabilities 4,062 2,609 2,974
Net cash provided by operating activities 419,963 411,096 289,191
Investing activities      
Purchases of leasehold improvements, property and equipment (197,037) (151,147) (113,215)
Acquisition of interests in equity method investment   (586) (1,900)
Purchases of investments (213,462) (183,251) (125,000)
Maturities of investments 55,000 124,766 50,234
Net cash used in investing activities (355,499) (210,218) (189,881)
Financing activities      
Acquisition of treasury stock (217,092) (63,508) (126,602)
Proceeds from employee stock plan transactions 481 574 17,650
Excess tax benefit on stock-based compensation 73,210 38,786 14,526
Payments on deemed landlord financing (133) (120) (96)
Net cash used in financing activities (143,534) (24,268) (94,522)
Effect of exchange rate changes on cash and cash equivalents 380 (205) 484
Net change in cash and cash equivalents (78,690) 176,405 5,272
Cash and cash equivalents at beginning of period 401,243 224,838 219,566
Cash and cash equivalents at end of period 322,553 401,243 224,838
Supplemental disclosures of cash flow information      
Income taxes paid 138,385 56,270 112,150
Increase in purchases of leasehold improvements, property and equipment accrued in accounts payable $ 4,455 $ 3,249 $ 1,480