Table:
|  | December 31, |  |
| --- | --- | --- |
|  | 2019 | 2018 |
| Customer relationships | $336,455 | $159,566 |
| Other | 15,621 | 5,555 |
|  | 352,076 | 165,121 |
| Accumulated amortization | (73,492) | (52,942) |
| Intangible assets, net | 278,584 | 112,179 |
Paragraphs:
(6) Intangible Assets
Intangible assets consist of the following (in thousands):
During 2019, we periodically assessed whether any indicators of impairment existed related to our intangible assets. As of each interim period end during the year, we concluded that a triggering event had not occurred that would more likely than not reduce the fair value of our intangible assets below their carrying values.
Amortization expense recognized in 2019, 2018 and 2017 was $23,671,000, $15,737,000 and $16,812,000, respectively.
Question:
How much was the Amortization expense in 2017?
Answer: $16,812,000