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Borrowings - Evolution of borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [abstract]      
Total debt $ 862,116 $ 817,958 $ 635,396
Issuance of senior notes 0 495,678 [1] 0 [1]
Proceeds from long-term borrowings 45,536 232,433 [1] 167,385 [1]
Payments of long-term borrowings (124,349) (602,700) [1] (277,913) [1]
Proceeds from short term borrowings 318,108 106,730  
Payments of short-term borrowings (190,630) (64,787) [1] $ (272,033) [1]
Payments of interest (1). (47,401) (39,118)  
Accrued interest 61,186 51,005  
Exchange differences, inflation and translation, net (19,506) (4,588)  
Others $ 1,214 $ 7,909  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.