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Investment properties (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Increase (Decrease) in Fair Value |
31 December 2018 |  |  | 31 December 2017 |
Cost |  |  |  |  |  |  |  |
Opening balance |  |  | 99,938 |  |  |  | 165,472 |
Disposal |  |  | — |  |  |  | (940 | )
Transfer to property, plant and equipment (*) |  |  | 45,821 |  |  |  | (64,594 | )
Closing balance |  |  | 145,759 |  |  |  | 99,938 |
Accumulated depreciation |  |  |  |  |  |  |  |
Opening balance |  |  | (98,958 | ) |  |  | (119,202 | )
Transfer to property, plant and equipment |  |  | (25,765 | ) |  |  | 22,366 |
Depreciation and impairment charges during the year |  |  | (5,611 | ) |  |  | (2,337 | )
Disposal |  |  | — |  |  |  | 215 |
Other |  |  | — |  |  |  | — |
Closing balance |  |  | (130,334 | ) |  |  | (98,958 | )
Net book amount |  |  | 15,425 |  |  |  | 980 |
(*) | During the year ended 31 December 2017, the Group transferred its building located in Istanbul, Tepebası from investment properties to property, plant and equipment due to the change in purpose of use.
Summary of Investment Properties and Information About Fair Value Hierarchy | The Group’s investment properties and their fair values at 31 December 2018 and 2017 are as follows:
31 December 2018 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Valuation Method
Investment properties in Gebze |  |  | — |  |  |  | — |  |  |  | 17,960 |  |  | Income capitalization approach
Investment properties in Ankara |  |  | — |  |  |  | — |  |  |  | 15,915 |  |  | Market approach
Investment properties in Istanbul |  |  | — |  |  |  | — |  |  |  | 13,800 |  |  | Market approach
Investment properties in Aydın |  |  | — |  |  |  | — |  |  |  | 2,110 |  |  | Market approach
|  |  | — |  |  |  | — |  |  |  | 49,785 |  |  |
31 December 2017 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Valuation Method
Investment properties in Izmir |  |  | — |  |  |  | — |  |  |  | 52,110 |  |  | Replacement cost approach
Investment properties in Gebze |  |  | — |  |  |  | — |  |  |  | 16,690 |  |  | Income capitalization approach
Investment properties in Ankara |  |  | — |  |  |  | — |  |  |  | 15,160 |  |  | Market approach
Investment properties in Istanbul |  |  | — |  |  |  | — |  |  |  | 13,000 |  |  | Market approach
Investment properties in Adana |  |  | — |  |  |  | — |  |  |  | 3,150 |  |  | Replacement cost approach
Investment properties in Balıkesir |  |  | — |  |  |  | — |  |  |  | 3,112 |  |  | Replacement cost approach
Other investment properties |  |  | — |  |  |  | — |  |  |  | 3,970 |  |  | Replacement cost approach
Other investment properties |  |  | — |  |  |  | — |  |  |  | 2,146 |  |  | Market approach
|  |  | — |  |  |  | — |  |  |  | 109,338 |  |

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