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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities    
Net income (loss) $ 112,850 $ (836)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 80,360 70,862
Deferred income tax (benefit) provision (5,939) 3,789
(Gain) loss on disposal and impairment of assets 3,266 5,403
Bad debt allowance 181 (120)
Stock-based compensation expense 36,846 30,038
Excess tax benefit on stock-based compensation 0 (1,982)
Other (107) (352)
Changes in operating assets and liabilities:    
Accounts receivable 15,372 15,201
Inventory (4,530) (1,921)
Prepaid expenses and other current assets (6,143) (12,267)
Other assets (984) 1,832
Accounts payable 8,271 (13,675)
Accrued liabilities (21,856) 31,973
Income tax payable/receivable 8,480 34,919
Deferred Rent 15,463 16,944
Other long-term liabilities 2,052 (143)
Net cash provided by operating activities 243,582 179,665
Investing activities    
Purchases of leasehold improvements, property and equipment (113,715) (126,712)
Purchases of investments (19,922) 0
Maturities of investments 80,000 45,000
Proceeds from sale of investments 0 540,648
Net cash provided by (used in) investing activities (53,637) 458,936
Financing activities    
Acquisition of treasury stock (103,827) (700,036)
Excess tax benefit on stock-based compensation 0 1,982
Stock plan transactions and other financing activities 9 12
Net cash used in financing activities (103,818) (698,042)
Effect of exchange rate changes on cash and cash equivalents 1,130 1,396
Net change in cash and cash equivalents 87,257 (58,045)
Cash and cash equivalents at beginning of period 87,880 248,005
Cash and cash equivalents at end of period $ 175,137 $ 189,960