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Borrowings - Evolution of borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [abstract]      
Total debt $ 817,958 $ 635,396 $ 723,339
Issuance of senior notes 495,678 0 0
Proceeds from long-term borrowings 232,433 167,385 299,343
Payments of long-term borrowings (602,700) (277,913) (165,455)
Proceeds from short term loans 106,730 257,395  
Payments of short-term borrowings (64,787) (272,033) $ (208,309)
Payments of interest (39,118) (45,473)  
Accrued interest 51,005 46,470  
Exchange differences and translation, net (4,588) 32,583  
Others $ 7,909 $ 3,643