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Financial Statement Schedule I - STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating activities:      
Net income $ 65,275 $ 173,316 $ 243,887
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 95,849 94,217 82,627
Loss on disposal of property, plant and equipment 8,094 1,801 1,478
(Gain) loss on change in fair value of derivatives (27,322) 12,196 (19,656)
Gain on repurchase of convertible notes (2,782)    
Allowance for doubtful accounts (280) 3,673 (8,528)
Equity in loss (earnings) of unconsolidated investees 4,404 643 (487)
Share-based compensation 7,757 5,966 5,088
Changes in operating assets and liabilities:      
Inventories (50,557) 50,821 (252,716)
Accounts receivable trade (33,060) (63,352) (73,777)
Amounts due from related parties (4,230) (99,893) 480
Advances to suppliers (30,609) 7,967 (3,622)
Prepaid expenses and other current assets (135,426) 36,745 (38,523)
Other non-current assets (1,308) (6,093) (8,446)
Accounts payable 61,157 (23,975) 135,812
Advances from customers 19,710 (30,123) 40,311
Amounts due to related parties (43,774) 47,522 (2,166)
Accrued warranty costs (3,847) 12,004 15,516
Other liabilities (995) 56,542 (16,282)
Liability for uncertain tax positions (6,037) (1,111) (1,613)
Deferred taxes (95,629) (112,263) 9,208
Net settlement of derivatives (1,922) 24,878 17,192
Net cash provided by (used in) operating activities (278,073) 413,658 265,106
Investing activities:      
(Increase) decrease in restricted cash 50,585 (100,935) (27,585)
Investment in subsidiaries (124,737) (84,389) (72)
Purchase of property, plant and equipment (286,722) (90,905) (49,660)
Net cash used in investing activities (1,042,557) (999,104) (116,049)
Financing activities:      
Proceeds from short-term borrowings 1,841,808 1,436,950 928,879
Repayment of short-term borrowings (2,243,003) (1,308,235) (1,045,596)
Proceeds from long-term borrowings 1,076,332 487,228 56,989
Proceeds from issuance of warrant   16,378  
Proceeds from issuance of common shares 23,864   115,009
Issuance costs paid for common shares offering (456)   (6,091)
Proceeds from issuance of convertible notes     150,000
Payments for repurchase of convertible notes (19,667)    
Proceeds from exercise of stock options 707 1,867 3,343
Net cash provided by financing activities 1,299,823 619,483 191,947
Effect of exchange rate changes (12,312) (30,501) (19,711)
Net increase (decrease) in cash and cash equivalents (33,119) 3,536 321,293
Cash and cash equivalents at the beginning of the year 553,079 549,543 228,250
Cash and cash equivalents at the end of the year 511,039 553,079 549,543
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) 70,827 49,619 47,227
Income taxes paid 187,876 87,348 14,016
Parent Company      
Operating activities:      
Net income 65,249 171,861 239,502
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 32 32 1
Loss on disposal of property, plant and equipment     4
(Gain) loss on change in fair value of derivatives (30,988) 13,571  
Gain on repurchase of convertible notes (2,782)    
Allowance for doubtful accounts (844) 1,535 11,434
Equity in earnings of subsidiaries (43,596) (193,813) (243,283)
Equity in loss (earnings) of unconsolidated investees (50) 273 280
Share-based compensation 7,757 5,966 5,088
Changes in operating assets and liabilities:      
Inventories 146 296 (286)
Accounts receivable trade 3,010 2,189 (5,244)
Amounts due from related parties 21,731 228,284 3,905
Advances to suppliers 226 (226) (11,836)
Prepaid expenses and other current assets 6,955 (7,106) (2,260)
Other non-current assets (2,039) (14,710) (19,727)
Accounts payable (4) 3 (9)
Advances from customers (1,413) 1,352 (657)
Amounts due to related parties (129,307) 103,348 (42,128)
Accrued warranty costs (12,381) (2,941) 84
Other liabilities (297) 4,484 3,544
Liability for uncertain tax positions (7,413) (1,111) 633
Deferred taxes 199 1,451 1,208
Net settlement of derivatives 17,043 (3,950)  
Net cash provided by (used in) operating activities (108,766) 310,788 (59,747)
Investing activities:      
(Increase) decrease in restricted cash 6,512 (6,513)  
Investment in subsidiaries   (116,840) (39,668)
Purchase of property, plant and equipment     (5)
(Funding) repayment of loans to subsidiaries 299,578 (550,776) (128,213)
Net cash used in investing activities 306,090 (674,129) (167,886)
Financing activities:      
Proceeds from short-term borrowings   10,000  
Repayment of short-term borrowings (190,000)   (12,246)
Proceeds from long-term borrowings   364,680  
Repayment of long-term borrowings     (16,393)
Proceeds from issuance of warrant   16,378  
Investment on non-controlling interest   (918)  
Proceeds from issuance of common shares 23,864   115,009
Issuance costs paid for common shares offering (456)   (6,090)
Proceeds from issuance of convertible notes     150,000
Payments for repurchase of convertible notes (19,667)    
Issuance cost paid on convertible notes     (5,103)
Proceeds from exercise of stock options 707 1,867 3,342
Net cash provided by financing activities (185,552) 392,007 228,519
Effect of exchange rate changes (24,630) 2,085 (27,016)
Net increase (decrease) in cash and cash equivalents (12,858) 30,751 (26,130)
Cash and cash equivalents at the beginning of the year 34,206 3,455 29,585
Cash and cash equivalents at the end of the year 21,348 34,206 3,455
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) $ 29,288 $ 15,299 3,942
Income taxes paid     $ 736