Goodwill and other intangible assets as of December 31, 2016 and 2017 are as follows:
| 2016 | 2017 | |||||||||||||||||||||||||||||||
| Acquisition cost |
Accumulated amortization and impairment loss |
Government grants |
Book value |
Acquisition cost |
Accumulated amortization and impairment loss |
Government grants |
Book value |
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| (in millions of Won) | ||||||||||||||||||||||||||||||||
|
Goodwill |
￦ | 1,669,556 | (294,425 | ) | — | 1,375,131 | 1,604,288 | (254,450 | ) | — | 1,349,838 | |||||||||||||||||||||
|
Intellectual property rights |
2,923,030 | (401,156 | ) | (703 | ) | 2,521,171 | 3,140,159 | (690,966 | ) | — | 2,449,193 | |||||||||||||||||||||
|
Premium in rental |
139,843 | (20,804 | ) | — | 119,039 | 139,873 | (21,563 | ) | — | 118,310 | ||||||||||||||||||||||
|
Development expense |
376,327 | (259,184 | ) | (131 | ) | 117,012 | 397,129 | (316,892 | ) | (19 | ) | 80,218 | ||||||||||||||||||||
|
Port facilities usage rights |
633,025 | (376,408 | ) | — | 256,617 | 705,692 | (396,319 | ) | — | 309,373 | ||||||||||||||||||||||
|
Exploration and evaluation assets |
196,124 | (33,856 | ) | — | 162,268 | 296,320 | (90,376 | ) | — | 205,944 | ||||||||||||||||||||||
|
Customer relationships |
859,643 | (345,398 | ) | — | 514,245 | 857,624 | (390,679 | ) | — | 466,945 | ||||||||||||||||||||||
|
Power generation permit |
539,405 | — | — | 539,405 | 539,405 | — | — | 539,405 | ||||||||||||||||||||||||
|
Other intangible assets |
1,007,871 | (524,000 | ) | (30 | ) | 483,841 | 1,006,219 | (573,152 | ) | (24 | ) | 433,043 | ||||||||||||||||||||
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| ￦ | 8,344,824 | (2,255,231 | ) | (864 | ) | 6,088,729 | 8,686,709 | (2,734,397 | ) | (43 | ) | 5,952,269 | ||||||||||||||||||||
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