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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income (loss) $ 102,312 $ (41,140)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 13,891 13,424
Stock-based compensation 40,592 36,224
Other, net 104 87
Unrealized gain on long term investments (20,989) (22,679)
Change in fair value of contingent consideration 6,671 6,685
Changes in operating assets and liabilities:    
Accounts receivable 63,517 46,109
Prepaid expenses and other assets 5,559 (18,922)
Inventory (600) 1,879
Accounts payable (33,464) 6,444
Accrued and other liabilities (21,930) (7,273)
Net cash provided by operating activities 155,663 20,838
Cash flows from investing activities:    
Purchase of long term investments   (8,937)
Capital expenditures (18,267) (12,590)
Purchases of marketable securities (34,574) (38,033)
Sale and maturities of marketable securities 28,278 31,032
Net cash used in investing activities (24,563) (28,528)
Cash flows from financing activities:    
Proceeds from issuance of common stock under stock plans 15,481 2,595
Payment of finance lease liabilities (195)  
Payment of contingent consideration (10,799)  
Net cash provided by financing activities 4,487 2,595
Effect of exchange rates on cash, cash equivalents, restricted cash and investments 126 35
Net increase (decrease) in cash, cash equivalents, restricted cash and investments 135,713 (5,060)
Cash, cash equivalents, restricted cash and investments at beginning of period 1,164,986 900,434
Cash, cash equivalents, restricted cash and investments at end of period 1,300,699 895,374
Supplemental Schedule of Cash Flow Information    
Income taxes paid 448 52
Unpaid purchases of property and equipment 8,414  
Leased assets obtained in exchange for new operating lease liabilities 932  
Leased assets obtained in exchange for new finance lease liabilities $ 645  
Convertible Senior Notes 0.375 Percent Due 2018    
Supplemental Schedule of Cash Flow Information    
Reclassification to common stock and additional paid in capital in connection with conversions of 0.375% convertible senior notes due 2018   $ 27