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BORROWINGS (Maturity of borrowings) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 3,221,907 | $ 1,218,635
Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,146,631 | 404,926
Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,075,276 | $ 813,709
2018 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,505,570 |
2018 | Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,112,760 |
2018 | Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 392,810 |
2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 422,944 |
2019 | Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 13,929 |
2019 | Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 409,015 |
2020 and thereafter |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,293,393 |
2020 and thereafter | Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 19,942 |
2020 and thereafter | Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 1,273,451 |

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