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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities    
Net income (loss) $ (26,432) $ 122,641
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 34,788 30,643
Deferred income tax (benefit) provision 2,259 (5,551)
Loss on disposal of assets 2,216 4,200
Bad debt allowance (40) (27)
Stock-based compensation expense 10,505 16,986
Excess tax benefit on stock-based compensation (680) (10,827)
Other (174) 119
Changes in operating assets and liabilities:    
Accounts receivable 14,642 13,300
Inventory (1,833) (737)
Prepaid expenses and other current assets (8,337) (2,516)
Other assets 1,468 (3,825)
Accounts payable (8,852) 14,831
Accrued liabilities 10,397 (21,367)
Income tax payable/receivable 23,796 75,314
Deferred rent 8,569 6,780
Other long-term liabilities (613) 2,755
Net cash provided by operating activities 61,679 242,719
Investing activities    
Purchases of leasehold improvements, property and equipment (62,921) (59,363)
Purchases of investments 0 139,114
Maturities of investments 45,000 95,000
Proceeds from Sale of Investments 540,648 0
Net cash provided by (used in) investing activities 522,727 (103,477)
Financing activities    
Acquisition of treasury stock (583,802) (23,249)
Excess tax benefit on stock-based compensation 680 10,827
Stock plan transactions and other financing activities (10) (119)
Net cash used in financing activities (583,132) (12,541)
Effect of exchange rate changes on cash and cash equivalents 1,526 (3,209)
Net change in cash and cash equivalents 2,800 123,492
Cash and cash equivalents at beginning of period 248,005 419,465
Cash and cash equivalents at end of period $ 250,805 $ 542,957