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Condensed Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities    
Net income $ 76,584 $ 62,664
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 22,936 20,084
Deferred income tax provision (benefit) (1,923) 1,803
Loss on disposal of assets 1,340 1,250
Bad debt allowance 9 12
Stock-based compensation expense 15,387 20,240
Excess tax benefit on stock-based compensation (1,869) (68,392)
Other 177 78
Changes in operating assets and liabilities:    
Accounts receivable 1,309 (710)
Inventory (340) (1,102)
Prepaid expenses and other current assets (4,376) (4,738)
Other assets (1,588) (9,946)
Accounts payable 773 2,909
Accrued liabilities (33,893) (31,435)
Income tax payable/receivable 42,721 29,260
Deferred rent 5,880 5,130
Other long-term liabilities 2,123 2,269
Net cash provided by operating activities 125,250 29,376
Investing activities    
Purchases of leasehold improvements, property and equipment (36,495) (41,864)
Purchases of investments (54,598) (60,382)
Maturities of investments 39,500  
Net cash used in investing activities (51,593) (102,246)
Financing activities    
Acquisition of treasury stock (50,965) (27,011)
Proceeds from employee stock plan transactions 155 81
Excess tax benefit on stock-based compensation 1,869 68,392
Other financing payments (35) (33)
Net cash provided by (used in) financing activities (48,976) 41,429
Effect of exchange rate changes on cash and cash equivalents (304) 389
Net change in cash and cash equivalents 24,377 (31,052)
Cash and cash equivalents at beginning of period 322,553 401,243
Cash and cash equivalents at end of period 346,930 370,191
Supplemental disclosures of cash flow information    
Decrease in purchases of leasehold improvements, property and equipment accrued in accounts payable $ 2,813 $ 149