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BORROWINGS (Maturity of borrowings) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 2,036,957 | $ 3,221,907
Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 289,883 | 1,146,631
Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,747,074 | $ 2,075,276
2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 399,856 |
2019 | Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 269,908 |
2019 | Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 129,948 |
2020 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 528,073 |
2020 | Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 19,975 |
2020 | Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 508,098 |
2021 and thereafter |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,109,028 |
2021 and thereafter | Fixed Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 0 |
2021 and thereafter | Floating Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 1,109,028 |

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