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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities    
Net income $ 59,446 $ 46,120
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 46,915 39,279
Deferred income tax (benefit) provision 5,683 (3,107)
Loss on disposal and impairment of assets 4,859 3,650
Bad debt allowance   180
Stock-based compensation expense 12,097 16,456
Other (320) (8)
Changes in operating assets and liabilities:    
Accounts receivable 13,767 18,693
Inventory 2,451 (3,737)
Prepaid expenses and other current assets (4,793) (2,928)
Other assets 3,855 (401)
Accounts payable 17,242 708
Accrued liabilities 18,831 (3,693)
Income tax payable/receivable 18,012 29,751
Deferred rent 5,420 8,882
Other long-term liabilities (2,349) 745
Net cash provided by operating activities 201,116 150,590
Investing activities    
Purchases of leasehold improvements, property and equipment (57,524) (57,088)
Purchases of investments (168,749) 0
Maturities of investments 145,000  
Net cash used in investing activities (81,273) (57,088)
Financing activities    
Acquisition of treasury stock (72,626) (59,137)
Stock plan transactions and other financing activities (22) 6
Net cash used in financing activities (72,648) (59,131)
Effect of exchange rate changes on cash and cash equivalents and restricted cash (24) 173
Net change in cash and cash equivalents and restricted cash 47,171 34,544
Cash, cash equivalents and restricted cash at beginning of period 214,170 116,370
Cash, cash equivalents and restricted cash at end of period $ 261,341 $ 150,914