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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
Net income $ 176,253 $ 22,938 $ 475,602
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 163,348 146,368 130,368
Deferred income tax (benefit) provision (18,026) (14,207) 11,666
Loss on disposal and impairment of assets 13,345 23,877 13,194
Bad debt allowance 214 (262) (23)
Stock-based compensation expense 65,255 64,166 57,911
Excess tax benefit on stock-based compensation 0 (1,320) (74,442)
Other (218) (604) 582
Changes in operating assets and liabilities:      
Accounts receivable (140) (1,923) (3,504)
Inventory (5,250) (91) 262
Prepaid expenses and other current assets (6,710) (4,259) (5,259)
Other assets (2,587) (4,855) (5,619)
Accounts payable 10,908 (6,734) 19,525
Accrued liabilities 38,574 33,491 (7,440)
Income tax payable/receivable (4,173) 54,340 32,756
Deferred Rent 29,996 37,030 32,911
Other long-term liabilities 6,316 1,287 4,826
Net cash provided by operating activities 467,105 349,242 683,316
Investing activities      
Purchases of leasehold improvements, property and equipment (216,777) (258,842) (257,418)
Purchases of investments (199,801) 0 (559,372)
Maturities of investments 330,000 45,000 352,650
Proceeds from sale of investments 0 540,648 0
Net cash provided by (used in) investing activities (86,578) 326,806 (464,140)
Financing activities      
Acquisition of treasury stock (285,920) (837,655) (460,675)
Excess tax benefit on stock-based compensation 0 1,320 74,442
Stock plan transactions and other financing activities 26 52 (207)
Net cash used in financing activities (285,894) (836,283) (386,440)
Effect of exchange rate changes on cash and cash equivalents 2,056 110 (4,196)
Net change in cash and cash equivalents 96,689 (160,125) (171,460)
Cash and cash equivalents at beginning of year 87,880 248,005 419,465
Cash and cash equivalents at end of year 184,569 87,880 248,005
Supplemental disclosures of cash flow information      
Income taxes paid 119,787 23,862 248,547
Increase (decrease) in purchases of leasehold improvements, property and equipment accrued in accounts payable and accrued liabilities (7,690) (1,781) (2,870)
Increase (decrease) in acquistion of treasury stock accrued in accrued liabilities $ (900) $ (22,778) $ 25,178