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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