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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |  |  |
Net income (loss) |  | $ (286,180) | $ (11,695) | $ 1,988
Less: Income (loss) from discontinued operations, net of tax |  | 382 | 2,597 | 0
Income (loss) from continuing operations |  | (286,562) | (14,292) | 1,988
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |  |
Depreciation and amortization of property, equipment and software |  | 77,792 | 91,410 | 101,330
Amortization of acquired intangible assets |  | 9,730 | 14,355 | 14,498
Impairment of goodwill |  | 109,486 | 0 | 0
Impairment of long-lived assets |  | 22,351 | 0 | 0
Restructuring-related impairment |  | 21,622 | 0 | 0
Stock-based compensation |  | 39,010 | 81,615 | 64,821
Impairments of investments |  | 6,684 | 9,961 | 10,156
Upward adjustment for observable price change of investment |  | 0 | (51,397) | 0
Deferred income taxes |  | (7,101) | (1,485) | (5,000)
(Gain) loss from changes in fair value of investments |  | 1,405 | 72,497 | 9,064
Amortization of debt discount on convertible senior notes |  | 14,621 | 13,200 | 11,916
Change in assets and liabilities, net of acquisitions and dispositions: |  |  |  |
Accounts receivable |  | 13,524 | 13,577 | 32,057
Prepaid expenses and other current assets |  | 42,249 | 3,176 | 7,166
Right-of-use assets - operating leases |  | 22,463 | 26,226 | 0
Accounts payable |  | 11,414 | (17,401) | 5,805
Accrued merchant and supplier payables |  | (142,624) | (109,176) | (45,268)
Accrued expenses and other current liabilities |  | 36,159 | (26,071) | (31,430)
Operating lease obligations |  | (36,864) | (28,552) | 0
Other, net |  | (18,957) | (6,360) | 13,752
Net cash provided by (used in) operating activities from continuing operations |  | (63,598) | 71,283 | 190,855
Net cash provided by (used in) operating activities from discontinued operations |  | 0 | 0 | 0
Net cash provided by (used in) operating activities |  | (63,598) | 71,283 | 190,855
Investing activities |  |  |  |
Purchases of property and equipment and capitalized software |  | (48,711) | (67,328) | (69,695)
Proceeds from sale of intangible assets |  | 0 | 0 | 1,500
Proceeds from sales and maturities of investments |  | 31,605 | 3,475 | 8,594
Acquisition of business, net of acquired cash |  | 0 | 0 | (58,119)
Acquisitions of intangible assets and other investing activities |  | (4,240) | (3,738) | (18,262)
Net cash provided by (used in) investing activities from continuing operations |  | (21,346) | (67,591) | (135,982)
Net cash provided by (used in) investing activities from discontinued operations |  | 1,224 | 0 | 0
Net cash provided by (used in) investing activities |  | (20,122) | (67,591) | (135,982)
Financing activities |  |  |  |
Proceeds from borrowings under revolving credit agreement |  | 200,000 | 0 | 0
Issuance costs for revolving credit agreement |  | (1,686) | (2,384) | 0
Payments for repurchases of common stock |  | 0 | (45,631) | (9,585)
Taxes paid related to net share settlements of stock-based compensation awards |  | (10,607) | (18,105) | (24,105)
Proceeds from stock option exercises and employee stock purchase plan |  | 1,791 | 4,123 | 5,715
Distributions to noncontrolling interest holders |  | (2,862) | (10,935) | (12,576)
Payments of finance lease obligations |  | (8,930) | (19,687) | (33,023)
Payments of contingent consideration related to acquisitions |  | (908) | 0 | (1,815)
Payment of financing obligation related to acquisition |  | 0 | 0 | (8,391)
Other financing activities |  | 0 | 0 | (637)
Net cash provided by (used in) financing activities |  | 176,798 | (92,619) | (84,417)
Effect of exchange rate changes on cash, cash equivalents and restricted cash, including cash classified within current assets of discontinued operations |  | 6,574 | (3,144) | (11,209)
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash classified within current assets of discontinued operations |  | 99,652 | (92,071) | (40,753)
Less: Net increase (decrease) in cash classified within current assets of discontinued operations |  | 1,224 | 0 | 0
Net increase (decrease) in cash, cash equivalents and restricted cash |  | 98,428 | (92,071) | (40,753)
Cash, cash equivalents and restricted cash, beginning of period | [1] | 752,657 | 844,728 | 885,481
Cash, cash equivalents and restricted cash, end of period | [1] | 851,085 | 752,657 | 844,728
Supplemental disclosure of cash flow information |  |  |  |
Cash paid for interest |  | 12,749 | 9,145 | 9,556
Non-cash investing and financing activities |  |  |  |
Equipment acquired under capital lease arrangements |  | 0 | 0 | 18,064
Cash paid for amounts included in operating cash flows from finance leases |  | (522) | (1,021) | 0
Cash paid for amounts included in operating cash flows from operating leases |  | (36,864) | (36,723) | 0
Right-of-use assets obtained in exchange for finance leases |  | 0 | 3,929 | 0
Right-of-use assets obtained in exchange for operating leases |  | 16,415 | 27,293 | 0
Restricted Cash [Abstract] |  |  |  |
Cash, cash equivalents and restricted cash | [1] | 851,085 | 844,728 | 885,481
Continuing Operations |  |  |  |
Operating activities |  |  |  |
Income (loss) from continuing operations |  | (286,562) | (14,292) | 1,988
Supplemental disclosure of cash flow information |  |  |  |
Income tax payments (refunds) |  | $ 3,262 | $ 11,898 | $ 2,781
[1] | The following table provides a reconciliation of cash, cash equivalents and restricted cash shown above to amounts reported within the consolidated balance sheets as of December 31, 2020, 2019 and 2018 (in thousands):
| December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 850,587 |  |  | $ | 750,887 |  |  | $ | 841,021 |
Restricted cash included in prepaid expenses and other current assets | 498 |  |  | 1,534 |  |  | 3,320 |
Restricted cash included in other non-current assets | — |  |  | 236 |  |  | 387 |
Cash, cash equivalents and restricted cash | $ | 851,085 |  |  | $ | 752,657 |  |  | $ | 844,728 |

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