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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

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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