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Financial Statement Schedule I - STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities:      
Net income $ 166,555 $ 242,431 $ 102,983
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 159,723 129,256 99,273
Impairment of long-lived assets 0 5,738 3,686
Loss on change in fair value of derivatives 22,218 19,230 272
Allowance for doubtful accounts 1,250 2,812 7,265
Equity in loss of unconsolidated investees (28,948) (5,908) (9,411)
Share-based compensation 10,682 10,258 9,314
Changes in operating assets and liabilities:      
Accounts receivable trade 51,670 (179,607) 46,337
Amounts due from related parties (17,347) 9,237 (10,089)
Advances to suppliers (27,066) 29,001 (15,990)
Prepaid expenses and other current assets 33,283 (2,208) (49,813)
Other non-current assets (24,037) 9,387 (23,795)
Accounts payable 209,175 47,756 (27,758)
Amounts due to related parties (5,798) 10,467 33,908
Other liabilities (10,851) (29,691) (18,774)
Liability for uncertain tax positions (4,775) 10,863 833
Deferred taxes (12,455) 37,591 84,939
Net settlement of derivatives (27,012) 28,731 (1,460)
Net cash provided by (used in) operating activities 600,111 216,280 203,920
Investing activities:      
Net cash provided by (used in) investing activities (294,102) 29,071 (239,230)
Financing activities:      
Repayment of short-term borrowings (1,649,721) (2,368,967) (2,068,069)
Repayment of convertible notes (127,500)    
Proceeds from exercise of stock options 875 769 879
Net cash provided by (used in) financing activities (34,614) (463,613) 165,283
Effect of exchange rate changes (6,965) (38,725) 51,342
Net increase (decrease) in cash, cash equivalents and restricted cash 264,430 (256,987) 181,315
Cash, cash equivalents and restricted cash at the beginning of the year 940,990 1,190,134 1,007,700
Cash, cash equivalents and restricted cash at the end of the year 1,205,420 940,990 1,190,134
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) 85,362 103,236 113,513
Income taxes paid 40,454 32,135 45,483
Parent Company | Reportable Legal Entities [Member]      
Operating activities:      
Net income 171,585 237,070 99,572
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 154 21 33
Loss on disposal of subsidiaries 116,879   9,559
Impairment of long-lived assets     3,686
Loss on change in fair value of derivatives 5,193 2,671 7,134
Allowance for doubtful accounts (83) (212) 2,666
Equity in earnings of subsidiaries (308,597) (195,950) (130,048)
Equity in loss of unconsolidated investees     127
Share-based compensation 10,682 10,259 9,314
Changes in operating assets and liabilities:      
Accounts receivable trade 11,563 (5,089) (6,739)
Amounts due from related parties (43,630) (184,755) 57,539
Advances to suppliers   60 (60)
Prepaid expenses and other current assets 5,449 (2,749) (5,715)
Other non-current assets (1,158) (149) 1,016
Accounts payable (3,900) 3,900  
Amounts due to related parties 183,675 15,598 55,399
Other liabilities 1,193 (25,958) 22,436
Liability for uncertain tax positions 408 6,008 833
Deferred taxes (1,292) 9,230 (6,106)
Net settlement of derivatives (11,125) 21,450 (6,358)
Net cash provided by (used in) operating activities 136,996 (108,595) 114,288
Investing activities:      
Investment in subsidiaries (36,146) (1,051) (64,185)
Investments in affiliates (2,483)    
Proceeds from disposal of subsidiaries     61,749
Purchase of property, plant and equipment 1   (26)
Funding of loans to subsidiaries (40,601) (94,000) (74,458)
Repayment of loans from subsidiaries 12,809 375,635  
Net cash provided by (used in) investing activities (66,420) 280,584 (76,920)
Financing activities:      
Repayment of short-term borrowings   (151,000) (49,000)
Proceeds from long-term borrowings 50,000    
Repayment of convertible notes (127,500)    
Payments for repurchase of treasury stock (11,845)    
Proceeds from exercise of stock options 875 769 879
Net cash provided by (used in) financing activities (88,470) (150,231) (48,121)
Effect of exchange rate changes 11,110 (29,618) 6,362
Net increase (decrease) in cash, cash equivalents and restricted cash (6,784) (7,860) (4,391)
Cash, cash equivalents and restricted cash at the beginning of the year 9,097 16,957 21,348
Cash, cash equivalents and restricted cash at the end of the year 2,313 9,097 16,957
Supplemental disclosure of cash flow information:      
Interest paid (net of amounts capitalized) $ 4,644 $ 10,154 $ 18,375