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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating activities      
Net income $ 475,602 $ 445,374 $ 327,438
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 130,368 110,474 96,054
Deferred income tax (benefit) provision 11,666 (20,671) 2,103
Loss on disposal of assets 13,194 6,976 6,751
Bad debt allowance (23) 9 19
Stock-based compensation expense 57,911 96,440 63,657
Excess tax benefit on stock-based compensation (74,442) (21,667) (38,379)
Other 582 104 507
Changes in operating assets and liabilities:      
Accounts receivable (3,504) (10,966) (7,238)
Inventory 262 (2,307) (1,950)
Prepaid expenses and other current assets (5,259) (658) (6,806)
Other assets (5,619) 1,071 (1,354)
Accounts payable 19,525 2,168 2,052
Accrued liabilities (7,440) 35,019 12,020
Income tax payable/receivable 32,756 8,831 44,334
Deferred rent 32,911 27,025 25,715
Other long-term liabilities 4,826 4,845 3,857
Net cash provided by operating activities 683,316 682,067 528,780
Investing activities      
Purchases of leasehold improvements, property and equipment (257,418) (252,590) (199,926)
Purchases of investments 559,372 521,004 387,639
Maturities of investments 352,650 254,750 159,250
Net cash used in investing activities (464,140) (518,844) (428,315)
Financing activities      
Acquisition of treasury stock (460,675) (88,338) (138,903)
Excess tax benefit on stock-based compensation 74,442 21,667 38,379
Stock plan transactions and other financing activities (207) (66) 173
Net cash used in financing activities (386,440) (66,737) (100,351)
Effect of exchange rate changes on cash and cash equivalents (4,196) (224) 536
Net change in cash and cash equivalents (171,460) 96,262 650
Cash and cash equivalents at beginning of year 419,465 323,203 322,553
Cash and cash equivalents at end of year 248,005 419,465 323,203
Supplemental disclosures of cash flow information      
Income taxes paid 248,547 280,687 160,973
Increase (decrease) in purchases of leasehold improvements, property and equipment accrued in accounts payable and accrued liabilities (2,870) 9,424 (1,736)
Increase (decrease) in acquistion of treasury stock accrued in accrued liabilities $ 25,178 $ 0 $ 0