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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities: |  |
Net income | $ 335,901 | $ 40,430
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 41,188 | 40,743
Stock-based compensation | 124,566 | 110,830
Other, net | 356 | 258
Unrealized (gain) loss on long term investments | (18,703) | 21,911
Change in fair value of acquisition-related contingent consideration | 16,560 | 18,708
Changes in operating assets and liabilities: |  |
Accounts receivable | 31,482 | 18,563
Prepaid expenses and other assets | 9,999 | (21,330)
Inventory | (2,913) | 3,030
Accounts payable | (8,451) | 27,807
Accrued and other liabilities | 49,053 | (8,561)
Net cash provided by operating activities | 579,038 | 252,389
Cash flows from investing activities: |  |
Purchase of long term investments |  | (8,936)
Capital expenditures | (48,749) | (48,202)
Purchases of marketable securities | (222,157) | (104,228)
Sale and maturities of marketable securities | 213,480 | 111,040
Net cash used in investing activities | (57,426) | (50,326)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock under stock plans | 33,783 | 20,480
Payment of finance lease liabilities | (626) |
Payment of contingent consideration | (16,766) | (9,886)
Net cash provided by financing activities | 16,391 | 10,594
Effect of exchange rates on cash, cash equivalents, restricted cash and investments | 29 | 97
Net increase in cash, cash equivalents, restricted cash and investments | 538,032 | 212,754
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 | 1,703,018 | 1,113,188
Supplemental Schedule of Cash Flow Information |  |
Interest paid | 119 | 134
Income taxes paid | 12,398 | 2,932
Leased assets obtained in exchange for new operating lease liabilities | 6,686 |
Leased assets obtained in exchange for new finance lease liabilities | $ 29,740 |
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 |  | $ 31

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