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Condensed Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating activities    
Net income $ 193,339 $ 164,437
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 52,763 46,533
Deferred income tax provision (benefit) (6,124) 7,301
Loss on disposal of assets 3,161 2,739
Bad debt allowance (18) 39
Stock-based compensation expense 61,401 34,333
Excess tax benefit on stock-based compensation (9,516) (4,251)
Other 3 262
Changes in operating assets and liabilities:    
Accounts receivable 3,754 1,795
Inventory (2,476) (181)
Prepaid expenses and other current assets (2,744) (7,596)
Other assets (3,574) (3,365)
Accounts payable 17,696 6,078
Accrued liabilities 15,781 (12,551)
Income tax payable/receivable 21,041 17,688
Deferred rent 12,584 11,794
Other long-term liabilities 3,360 2,698
Net cash provided by operating activities 360,431 267,753
Investing activities    
Purchases of leasehold improvements, property and equipment (102,840) (80,130)
Purchases of investments (191,281) (230,397)
Maturities of investments 121,250 78,750
Net cash used in investing activities (172,871) (231,777)
Financing activities    
Acquisition of treasury stock (50,292) (81,065)
Excess tax benefit on stock-based compensation 9,516 4,251
Other financing proceeds (payments) (55) 191
Net cash used in financing activities (40,831) (76,623)
Effect of exchange rate changes on cash and cash equivalents 118 (274)
Net change in cash and cash equivalents 146,847 (40,921)
Cash and cash equivalents at beginning of period 323,203 322,553
Cash and cash equivalents at end of period 470,050 281,632
Supplemental disclosures of cash flow information    
Increase (decrease) in purchases of leasehold improvements, property and equipment accrued in accounts payable $ 917 $ (1,432)