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OTHER INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2024
OTHER INTANGIBLE ASSETS [Abstract] |
Intangible Assets Disclosure [Text Block] | (7)OTHER INTANGIBLE ASSETS Other intangible assets, net which are included in the accompanying Consolidated Balance Sheets consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Acquisitions |  | Effect of |  | ​ | ​ |
​ | ​ | December 31, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and | ​ | Foreign | ​ | December 31, |
​ | ​ | 2023 | ​ | Amortization | ​ | Impairments | ​ | Adjustments | ​ | Currency | ​ | 2024 |
Customer relationships, gross | ​ | $ | 348,673 | ​ | $ | — | ​ | $ | — |  | $ | 7,198 |  | $ | (3,160) | ​ | $ | 352,711 | ​
Customer relationships - accumulated amortization | ​ |  | (150,385) | ​ |  | (32,939) | ​ |  | — |  | ​ | (7,198) |  | ​ | 2,512 | ​ |  | (188,010) | ​
Other intangible assets, gross | ​ |  | 21,099 | ​ |  | — | ​ |  | — |  | ​ | (1) |  | ​ | (255) | ​ |  | 20,843 | ​
Other intangible assets - accumulated amortization | ​ |  | (20,954) | ​ |  | (38) | ​ |  | — |  | ​ | 1 |  | ​ | 255 | ​ |  | (20,736) | ​
Other intangible assets, net | ​ | $ | 198,433 | ​ | $ | (32,977) | ​ | $ | — | ​ | $ | — | ​ | $ | (648) | ​ | $ | 164,808 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ |  | ​ |  | Acquisitions |  | Effect of |  | ​ | ​ |
​ | ​ | December 31, | ​ | ​ | ​ | ​ | ​ | and | ​ | Foreign | ​ | December 31, |
​ | ​ | 2022 | ​ | Amortization | ​ | Impairments | ​ | Adjustments | ​ | Currency | ​ | 2023 |
Customer relationships, gross | ​ | $ | 347,992 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 681 | ​ | $ | 348,673 | ​
Customer relationships - accumulated amortization | ​ |  | (116,038) | ​ |  | (33,768) | ​ |  | — | ​ |  | — | ​ |  | (579) | ​ |  | (150,385) | ​
Other intangible assets, gross | ​ |  | 21,044 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 55 | ​ |  | 21,099 | ​
Other intangible assets - accumulated amortization | ​ |  | (19,089) | ​ |  | (1,810) | ​ |  | — | ​ |  | — | ​ |  | (55) | ​ |  | (20,954) | ​
Other intangible assets, net | ​ | $ | 233,909 | ​ | $ | (35,578) | ​ | $ | — | ​ | $ | — | ​ | $ | 102 | ​ | $ | 198,433 | ​
​ Customer relationships are being amortized over the remaining weighted average useful life of 5.5 years and other intangible assets are being amortized over the remaining weighted average useful life of 1.1 years. Amortization expense related to intangible assets was $33.0 million, $35.6 million and $37.1 million for the years ended December 31, 2024, 2023 and 2022, respectively. Expected future amortization of other intangible assets as of December 31, 2024 is as follows (in thousands): ​
​ | ​ | ​ | ​
2025 |  | $ | 30,941
2026 | ​ |  | 30,880
2027 | ​ |  | 30,880
2028 | ​ |  | 30,135
2029 | ​ |  | 24,272
Thereafter | ​ |  | 17,700
Total | ​ | $ | 164,808
​

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