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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill | The following table presents the carrying amount of goodwill (in thousands):
| Total |
Balance at January 1, 2017 | $ | 262,376 |
Acquisition |  | 86,504 |
Other |  | (219 | )
Balance at December 31, 2017 before adjustment to conform goodwill to current presentation |  | 348,661 |
Goodwill associated with Disposition |  | (29,389 | )
Balance at December 31, 2017 |  | 319,272 |
Acquisition |  | 164,976 |
Other |  | (664 | )
Balance at December 31, 2018 | $ | 483,584 |
Components of Other Intangible Assets | The components of the “Other intangible assets” are as follows (in thousands):
|  |  |  |  |  |  | Net |  |
| Gross |  | Accumulated |  | Carrying |  |
| Amount |  | Amortization |  | Value |  | Life
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 144,123 |  | $ | (10,563 | ) | $ | 133,560 |  | 5-15 years
Trade name | $ | 1,300 |  | $ | (72 | ) | $ | 1,228 |  | 18 months
Total | $ | 145,423 |  | $ | (10,635 | ) | $ | 134,788 |  |
|  |  |  |  |  |  | Net |  |
| Gross |  | Accumulated |  | Carrying |  |
| Amount |  | Amortization |  | Value |  | Life
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 71,581 |  | $ | (6,834 | ) | $ | 64,747 |  | 7-15 years
Amortization Expense | Amortization expense for the next five years is as follows (in thousands):
| Total |
2019 | $ | 13,822 |
2020 |  | 13,316 |
2021 |  | 12,742 |
2022 |  | 12,700 |
2023 |  | 12,555 |

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