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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities    
Net income $ 262,845 $ 193,339
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 63,083 52,763
Deferred income tax (benefit) provision (13,032) (6,124)
Loss on disposal of assets 5,588 3,161
Bad debt allowance (27) (18)
Stock-based compensation expense 38,729 61,401
Excess tax benefit on stock-based compensation (58,058) (9,516)
Other 229 3
Changes in operating assets and liabilities:    
Accounts receivable 9,093 3,754
Inventory (1,205) (2,476)
Prepaid expenses and other current assets (4,915) (2,744)
Other assets (4,483) (3,574)
Accounts payable 14,111 17,696
Accrued liabilities 5,083 15,781
Income tax payable/receivable 66,694 21,041
Deferred rent 13,512 12,584
Other long-term liabilities 3,883 3,360
Net cash provided by operating activities 401,130 360,431
Investing activities    
Purchases of leasehold improvements, property and equipment (114,395) (102,840)
Purchases of investments (273,907) (191,281)
Maturities of investments 216,000 121,250
Net cash used in investing activities (172,302) (172,871)
Financing activities    
Acquisition of treasury stock (116,322) (50,292)
Excess tax benefit on stock-based compensation 58,058 9,516
Stock plan transactions and other financing activities (175) (55)
Net cash used in financing activities (58,439) (40,831)
Effect of exchange rate changes on cash and cash equivalents (2,169) 118
Net change in cash and cash equivalents 168,220 146,847
Cash and cash equivalents at beginning of year 419,465 323,203
Cash and cash equivalents at end of period 587,685 470,050
Supplemental disclosures of cash flow information    
Increase (decrease) in purchases of leasehold improvements, property and equipment accrued in accounts payable and accrued liabilities $ (3,879) $ 917