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Financial Statement Schedule I - STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities:      
Net income $ 242,431 $ 102,983 $ 65,275
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 129,256 99,273 95,849
Impairment loss of investment 5,738 3,686 0
(Gain) loss on change in fair value of derivatives 19,230 272 (27,322)
Gain on repurchase of convertible notes     (2,782)
Allowance for doubtful accounts 2,812 7,265 (280)
Equity in loss (earnings) of unconsolidated investees (5,908) (9,411) 4,404
Share-based compensation 10,258 9,314 7,757
Changes in operating assets and liabilities:      
Inventories 55,408 (49,024) (50,557)
Accounts receivable trade (179,607) 46,337 (33,060)
Amounts due from related parties 9,237 (10,089) (4,230)
Advances to suppliers 29,001 (15,990) (30,609)
Prepaid expenses and other current assets (2,208) (49,813) (135,426)
Other non-current assets 9,387 (23,795) (1,308)
Accounts payable 47,756 (27,758) 61,157
Advances from customers (11,225) (44,985) 19,710
Amounts due to related parties 10,467 33,908 (43,774)
Accrued warranty costs (3,563) (6,726) (3,847)
Other liabilities (29,691) (18,774) (995)
Liability for uncertain tax positions 10,863 833 (6,037)
Deferred taxes 37,591 84,939 (95,629)
Net settlement of derivatives 28,731 (1,460) (1,922)
Net cash provided by (used in) operating activities 216,280 203,920 (278,073)
Investing activities:      
Investment in subsidiaries (11,036) (92,925) (124,737)
Purchase of property, plant and equipment (316,282) (276,978) (286,722)
Net cash used in investing activities 29,071 (239,230) (1,093,142)
Financing activities:      
Repayment of short-term borrowings (2,368,967) (2,068,069) (2,243,003)
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 769 879 707
Net cash provided by(used in) financing activities (463,613) 165,283 1,299,823
Effect of exchange rate changes (38,725) 51,342 (46,629)
Net increase (decrease) in cash, cash equivalents and restricted cash (256,987) 181,315 (118,021)
Cash, cash equivalents and restricted cash at the beginning of the year 1,190,134 1,007,700 1,134,683
Cash, cash equivalents and restricted cash at the end of the year 940,990 1,190,134 1,007,700
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) 103,236 113,513 70,827
Income taxes paid 32,135 45,483 187,876
Parent Company      
Operating activities:      
Net income 237,070 99,572 65,249
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 21 33 32
Loss on disposal of subsidiaries   9,559  
Impairment loss of investment   3,686  
(Gain) loss on change in fair value of derivatives 2,671 7,134 (30,988)
Gain on repurchase of convertible notes     (2,782)
Allowance for doubtful accounts (212) 2,666 (844)
Equity in earnings of subsidiaries (195,950) (130,048) (43,596)
Equity in loss (earnings) of unconsolidated investees   127 (50)
Share-based compensation 10,259 9,314 7,757
Changes in operating assets and liabilities:      
Inventories     146
Accounts receivable trade (5,089) (6,739) 3,010
Amounts due from related parties (184,755) 57,539 21,731
Advances to suppliers 60 (60) 226
Prepaid expenses and other current assets (2,749) (5,715) 6,955
Other non-current assets (149) 1,016 (2,039)
Accounts payable 3,900   (4)
Advances from customers   (1,069) (1,413)
Amounts due to related parties 15,674 66,038 (129,307)
Accrued warranty costs (76) (10,639) (12,381)
Other liabilities (25,958) 23,505 (297)
Liability for uncertain tax positions 6,008 833 (7,413)
Deferred taxes 9,230 (6,106) 199
Net settlement of derivatives 21,450 (6,358) 17,043
Net cash provided by (used in) operating activities (108,595) 114,288 (108,766)
Investing activities:      
Investment in subsidiaries (1,051) (64,185)  
Proceeds from disposal of subsidiaries   61,749  
Purchase of property, plant and equipment   (26)  
Funding of loans to subsidiaries (94,000) (74,458)  
Repayment of loans from subsidiaries 375,635   299,578
Net cash used in investing activities 280,584 (76,920) 299,578
Financing activities:      
Repayment of short-term borrowings (151,000) (49,000) (190,000)
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 769 879 707
Net cash provided by(used in) financing activities (150,231) (48,121) (185,552)
Effect of exchange rate changes (29,618) 6,362 (24,630)
Net increase (decrease) in cash, cash equivalents and restricted cash (7,860) (4,391) (19,370)
Cash, cash equivalents and restricted cash at the beginning of the year 16,957 21,348 40,718
Cash, cash equivalents and restricted cash at the end of the year 9,097 16,957 21,348
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) $ 10,154 $ 18,375 $ 29,288