| $000 | | Dec 31, 2017 | | Dec 31, 2016 | | Dec 31, 2015 | | |||
| | | | | | | | | | | |
| Gross finance lease liabilities minimum lease payments: | | | | | | | | | | |
| No later than 1 year | | | 11,042 | | | 12,979 | | | 12,100 | |
| Later than 1 year and no later than 5 years | | | 39,872 | | | 42,239 | | | 52,968 | |
| Later than 5 years | | | 6,694 | | | 13,344 | | | 13,381 | |
| Future finance charges | | | (9,662) | | | (13,545) | | | (18,696) | |
| Present value of the finance lease liability | | | 47,946 | | | 55,017 | | | 59,753 | |
| | | | | | | | | | | |
| No later than 1 year | | | 7,596 | | | 8,310 | | | 8,223 | |
| Later than 1 year and no later than 5 years | | | 32,618 | | | 32,853 | | | 38,858 | |
| Later than 5 years | | | 7,732 | | | 13,854 | | | 12,672 | |
| | | | 47,946 | | | 55,017 | | | 59,753 | |