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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Statement of Cash Flows [Abstract]    
Net income (loss) $ (303,294) $ 70,582
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 30,540 19,385
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 6,000 0
Stock-based compensation 51,601 62,560
Excess tax benefit from stock-based compensation (2,374) (32,550)
Deferred income taxes (20,956) (6,888)
Other 4,754 4,433
Changes in operating assets and liabilities:    
Accounts receivable, net 53,706 63,348
Inventory 43,001 (136,294)
Prepaid expenses and other assets (10,526) (20,027)
Accounts payable and other liabilities 28,584 113,141
Deferred revenue (1,485) (927)
Net cash provided by (used in) operating activities (120,449) 136,763
Investing activities:    
Purchases of property and equipment, net (26,516) (32,326)
Purchases of marketable securities 0 (207,186)
Acquisitions, net of cash acquired (104,353) (65,405)
Net cash used in investing activities (30,854) (230,426)
Financing activities:    
Proceeds from issuance of common stock, net 5,342 23,807
Excess tax benefit from stock-based compensation 2,374 32,550
Payment of deferred acquisition-related consideration (950) 0
Payment of credit facility issuance costs (3,287) 0
Payment of deferred public offering costs 0 (903)
Net cash provided by financing activities 3,479 55,454
Effect of exchange rate changes on cash and cash equivalents (271) (1,751)
Net decrease in cash and cash equivalents (148,095) (39,960)
Cash and cash equivalents at beginning of period 279,672 319,929
Cash and cash equivalents at end of period 131,577 279,969
Maturities of marketable securities 93,224 50,536
Sale of marketable securities $ 6,791 $ 23,955