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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities    
Net income $ 132,460 $ 6,963
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 121,906 108,296
Deferred income tax (benefit) provision (11,323) 380
Loss on disposal and impairment of assets 10,013 22,040
Bad debt allowance 181 99
Stock-based compensation expense 54,596 48,389
Excess tax benefit on stock-based compensation 0 (1,888)
Other (126) (224)
Changes in operating assets and liabilities:    
Accounts receivable 16,477 16,084
Inventory (7,023) (3,442)
Prepaid expenses and other current assets (4,890) (5,362)
Other assets (1,382) 1,509
Accounts payable 14,771 (11,938)
Accrued liabilities 35,514 36,245
Income tax payable/receivable (7,810) 36,026
Deferred Rent 22,410 27,319
Other long-term liabilities 3,060 576
Net cash provided by operating activities 378,834 281,072
Investing activities    
Purchases of leasehold improvements, property and equipment (165,506) (192,252)
Purchases of investments (120,084) 0
Maturities of investments 140,000 45,000
Proceeds from sale of investments 0 540,648
Net cash provided by (used in) investing activities (145,590) 393,396
Financing activities    
Acquisition of treasury stock (209,585) (771,354)
Excess tax benefit on stock-based compensation 0 1,888
Stock plan transactions and other financing activities 10 23
Net cash used in financing activities (209,575) (769,443)
Effect of exchange rate changes on cash and cash equivalents 1,931 1,098
Net change in cash and cash equivalents 25,600 (93,877)
Cash and cash equivalents at beginning of period 87,880 248,005
Cash and cash equivalents at end of period $ 113,480 $ 154,128