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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities    
Net income (loss) $ 46,120 $ (26,432)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 39,279 34,788
Deferred income tax (benefit) provision (3,107) 2,259
Loss on disposal and impairment of assets 3,650 2,216
Bad debt allowance 180 (40)
Stock-based compensation expense 16,456 10,505
Excess tax benefit on stock-based compensation 0 (680)
Other 8 174
Changes in operating assets and liabilities:    
Accounts receivable 18,693 14,642
Inventory (3,737) (1,833)
Prepaid expenses and other current assets (2,928) (8,337)
Other assets (412) 1,468
Accounts payable 708 (8,852)
Accrued liabilities (3,693) 10,397
Income tax payable/receivable 29,751 23,796
Deferred rent 8,882 8,569
Other long-term liabilities 745 (613)
Net cash provided by operating activities 150,579 61,679
Investing activities    
Purchases of leasehold improvements, property and equipment (57,088) (62,921)
Maturities of investments 0 45,000
Proceeds from sale of investments 0 540,648
Net cash provided by (used in) investing activities (57,088) 522,727
Financing activities    
Acquisition of treasury stock (59,137) (583,802)
Excess tax benefit on stock-based compensation 0 680
Stock plan transactions and other financing activities 6 (10)
Net cash used in financing activities (59,131) (583,132)
Effect of exchange rate changes on cash and cash equivalents 173 1,526
Net change in cash and cash equivalents 34,533 2,800
Cash and cash equivalents at beginning of period 87,880 248,005
Cash and cash equivalents at end of period $ 122,413 $ 250,805