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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities: |  |  |
Net income | $ 147,246 | $ 166,555 | $ 242,431
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 209,118 | 159,723 | 129,256
Accretion of convertible notes | 388 |  |
Loss (gain) on disposal of property, plant and equipment | (253) | 1,227 | 2,565
Gain on disposal of solar power systems |  | (1,666) | (36,098)
Gain on disposal of investment in affiliates | (13,936) | (1,928) | (47,102)
Impairment loss of property, plant and equipment | 11,854 | 21,866 | 30,968
Impairment loss of project assets | 369 | 20,194 | 9,016
Impairment loss of investment | 24,060 | 0 | 5,738
Loss (gain) on change in fair value of derivatives, net | (50,001) | 22,218 | 19,230
Equity in loss of unconsolidated investees | (10,779) | (28,948) | (5,908)
Allowance for credit losses | 9,874 | 1,250 | 2,812
Non-cash operating lease expenses | 19,260 | 14,318 |
Write-down of inventories | 42,907 | 19,447 | 14,646
Share-based compensation | 12,350 | 10,682 | 10,258
Unrealized gain (loss) from sales to affiliates | (66) | 6,194 | (13,573)
Derecognition of commodity hedge and interest rate swap | 4,439 |  |
Changes in operating assets and liabilities: |  |  |
Accounts receivable trade | 65,379 | 51,670 | (179,607)
Accounts receivable, unbilled | (12,064) | (15,268) | 1,158
Amounts due from related parties | 26,828 | (17,347) | 9,237
Inventories | (180,974) | (312,781) | 55,408
Value added tax recoverable | 2,687 | (849) | (9,206)
Advances to suppliers | (138,915) | (27,066) | 29,001
Project assets | (443,730) | 28,527 | (30,501)
Prepaid expenses and other current assets | (72,188) | 33,283 | (2,208)
Other non-current assets | (11,913) | (24,037) | 9,387
Accounts payable | (89,180) | 209,175 | 47,756
Short-term notes payable | 120,445 | 185,827 | (173,148)
Amounts due to related parties | (9,773) | (5,798) | 10,467
Other payables | 10,386 | 42,810 | 39,791
Advances from customers | 51,683 | 96,115 | (11,225)
Operating lease liabilities | (19,369) | (12,566) |
Other liabilities | 179,911 | (10,851) | (29,691)
Accrued warranty costs | (19,143) | 4,624 | (3,563)
Prepaid land use rights | 452 | 2,622 | 6,557
Goodwill |  | 1,005 | 5,243
Liability for uncertain tax positions | (623) | (4,775) | 10,863
Deferred taxes | (21,439) | (12,455) | 37,591
Net settlement of derivatives | 33,054 | (27,012) | 28,731
Loss contingency accruals | 1,115 | 4,126 |
Net cash provided by (used in) operating activities | (120,541) | 600,111 | 216,280
Investing activities: |  |  |
Investments in affiliates | (17,758) | (7,684) | (11,036)
Return of investment from affiliates |  | 3,012 | 816
Proceeds from disposal of investment in affiliates | 33,037 | 1,649 | 337,773
Purchase of property, plant and equipment and intangible assets | (334,781) | (291,182) | (316,282)
Purchase of solar power systems | (160) |  |
Proceeds from disposal of solar power systems |  | 103 | 17,800
Net cash provided by (used in) investing activities | (319,662) | (294,102) | 29,071
Financing activities: |  |  |
Proceeds from short-term borrowings | 1,667,703 | 1,257,009 | 1,430,708
Repayment of short-term borrowings | (1,561,597) | (1,649,721) | (2,368,967)
Proceeds from long-term borrowings | 207,632 | 530,990 | 382,831
Acquisition of non-controlling interest |  | (14,176) | (6,591)
Proceeds from non-controlling interests | 261,332 | 11,488 | 10,470
Proceeds from third party financing liabilities | 6,419 | 3,000 | 119,095
Proceeds from sales-leaseback arrangement | 9,945 | 9,044 | 35,944
Distributions to tax equity investors |  | (1,120) | (3,013)
Repayment of finance lease obligation | (22,173) | (42,658) | (64,859)
Net proceeds from issuance of convertible notes | 222,826 |  |
Payments for repurchase of convertible notes |  | (127,500) |
Proceeds from subscription of employee stock ownership plan | 36,342 |  |
Proceeds from exercise of stock options | 1,035 | 875 | 769
Payments for repurchase of treasury stock | (5,963) | (11,845) |
Net cash provided by (used in) financing activities | 823,501 | (34,614) | (463,613)
Effect of exchange rate changes | 50,997 | (6,965) | (38,725)
Net increase (decrease) in cash and cash equivalents | 434,295 | 264,430 | (256,987)
Cash and cash equivalents at the beginning of the year | 1,205,420 | 940,990 | 1,190,134
Less: net decrease in cash, cash equivalents and restricted cash classified within assets held-for-sale |  |  | (7,843)
Cash and cash equivalents at the end of the year | 1,639,715 | 1,205,420 | 940,990
Supplemental disclosure of cash flow information: |  |  |
Interest paid (net of amounts capitalized) | 78,747 | 85,362 | 103,236
Income taxes paid, net of tax refund | 38,193 | 40,454 | 32,135
Supplemental schedule of non-cash activities: |  |  |
Property, plant and equipment costs included in other payables | $ 244,512 | $ 244,483 | $ 228,970

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