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Financial Statement Schedule I - STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net income $ 102,983 $ 65,275 $ 173,316
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 99,273 95,849 94,217
Impairment loss of investment 3,686 0 0
(Gain) loss on change in fair value of derivatives 272 (27,322) 12,196
Gain on repurchase of convertible notes   (2,782)  
Allowance for doubtful accounts 7,265 (280) 3,673
Equity in loss (earnings) of unconsolidated investees (9,411) 4,404 643
Share-based compensation 9,314 7,757 5,966
Changes in operating assets and liabilities:      
Inventories (49,024) (50,557) 50,821
Accounts receivable trade 46,337 (33,060) (63,352)
Amounts due from related parties (10,089) (4,230) (99,893)
Advances to suppliers (15,990) (30,609) 7,967
Prepaid expenses and other current assets (49,813) (135,426) 36,745
Other non-current assets (23,795) (1,308) (6,093)
Accounts payable (27,758) 61,157 (23,975)
Advances from customers (44,985) 19,710 (30,123)
Amounts due to related parties 33,908 (43,774) 47,522
Accrued warranty costs (6,726) (3,847) 12,004
Other liabilities (18,774) (995) 56,542
Liability for uncertain tax positions 833 (6,037) (1,111)
Deferred taxes 84,939 (95,629) (112,263)
Net settlement of derivatives (1,460) (1,922) 24,878
Net cash provided by (used in) operating activities 203,920 (278,073) 413,658
Investing activities:      
(Increase) decrease in restricted cash (101,985) 50,585 (100,935)
Investment in subsidiaries (92,925) (124,737) (84,389)
Purchase of property, plant and equipment (276,978) (286,722) (90,905)
Net cash used in investing activities (341,215) (1,042,557) (999,104)
Financing activities:      
Proceeds from short-term borrowings 1,646,910 1,841,808 1,436,950
Repayment of short-term borrowings (2,068,069) (2,243,003) (1,308,235)
Proceeds from long-term borrowings 690,841 1,076,332 487,228
Proceeds from issuance of warrant     16,378
Investment on non-controlling interest     (927)
Proceeds from issuance of common shares   23,864  
Issuance costs paid for common shares offering   (456)  
Payments for repurchase of convertible notes   (19,667)  
Proceeds from exercise of stock options 879 707 1,867
Net cash provided by financing activities 165,283 1,299,823 619,483
Effect of exchange rate changes 21,444 (12,312) (30,501)
Net increase (decrease) in cash and cash equivalents 49,432 (33,119) 3,536
Cash and cash equivalents at the beginning of the year 511,039 553,079 549,543
Cash and cash equivalents at the end of the year 561,679 511,039 553,079
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) 113,513 70,827 49,619
Income taxes paid 45,483 187,876 87,348
Parent Company      
Operating activities:      
Net income 99,572 65,249 171,861
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 33 32 32
Loss on disposal of subsidiaries 9,559    
Impairment loss of investment 3,686    
(Gain) loss on change in fair value of derivatives 7,134 (30,988) 13,571
Gain on repurchase of convertible notes   (2,782)  
Allowance for doubtful accounts 2,666 (844) 1,535
Equity in earnings of subsidiaries (130,048) (43,596) (193,813)
Equity in loss (earnings) of unconsolidated investees 127 (50) 273
Share-based compensation 9,314 7,757 5,966
Changes in operating assets and liabilities:      
Inventories   146 296
Accounts receivable trade (6,739) 3,010 2,189
Amounts due from related parties 57,539 21,731 228,284
Advances to suppliers (60) 226 (226)
Prepaid expenses and other current assets (5,715) 6,955 (7,106)
Other non-current assets 1,016 (2,039) (14,710)
Accounts payable   (4) 3
Advances from customers (1,069) (1,413) 1,352
Amounts due to related parties 66,038 (129,307) 103,348
Accrued warranty costs (10,639) (12,381) (2,941)
Other liabilities 23,505 (297) 4,484
Liability for uncertain tax positions 833 (7,413) (1,111)
Deferred taxes (6,106) 199 1,451
Net settlement of derivatives (6,358) 17,043 (3,950)
Net cash provided by (used in) operating activities 114,288 (108,766) 310,788
Investing activities:      
(Increase) decrease in restricted cash   6,512 (6,513)
Investment in subsidiaries (64,185)   (116,840)
Proceeds from disposal of subsidiaries 61,749    
Purchase of property, plant and equipment (26)    
(Funding) repayment of loans to subsidiaries (74,458) 299,578 (550,776)
Net cash used in investing activities (76,920) 306,090 (674,129)
Financing activities:      
Proceeds from short-term borrowings     10,000
Repayment of short-term borrowings (49,000) (190,000)  
Proceeds from long-term borrowings     364,680
Proceeds from issuance of warrant     16,378
Investment on non-controlling interest     (918)
Proceeds from issuance of common shares   23,864  
Issuance costs paid for common shares offering   (456)  
Payments for repurchase of convertible notes   (19,667)  
Proceeds from exercise of stock options 879 707 1,867
Net cash provided by financing activities (48,121) (185,552) 392,007
Effect of exchange rate changes 6,362 (24,630) 2,085
Net increase (decrease) in cash and cash equivalents (4,391) (12,858) 30,751
Cash and cash equivalents at the beginning of the year 21,348 34,206 3,455
Cash and cash equivalents at the end of the year 16,957 21,348 34,206
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) $ 18,375 $ 29,288 $ 15,299