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Commitments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Commitments [Abstract] |
Future minimum lease revenues receivable under non-cancellable operating leases |
| 2017 | 2016
Within one year | 1,548 | 1,086
Total | 1,548 | 1,086
Future minimum lease payments |
| 2017 | 2016
Within one year | 149 | 131
After one year but not more than five years | 596 | 522
More than five years | 299 | 392
Total | 1,044 | 1,045

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