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Commitments (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
Commitments [Abstract] |
Future minimum lease revenues receivable under non-cancellable operating leases |
| June 30, 2018 | December 31, 2017
Within one year | 2,724 | 1,548
Total | 2,724 | 1,548
Future minimum lease payments |
|  | June 30, 2018
Within one year |  | 144
After one year but not more than five years |  | 577
More than five years |  | 217
Total |  | 938

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