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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | NOTE 7. Goodwill and Other Intangible Assets In accordance with the FASB issued guidance in the Intangibles-Goodwill and Other Topic of the Codification, we completed the required annual impairment tests. We performed a qualitative assessment on goodwill and determined it was not, more-likely-than-not, that the fair value of our reporting unit was less than its carrying value. There were no accumulated impairment losses of goodwill at the beginning of the period. 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 |
The changes noted as “other” in the table above for both 2018 and 2017 refer to the amortization of the income tax benefit of tax goodwill in excess of financial statement goodwill and the changes in purchase accounting. 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
The above intangible assets are amortized using the straight-line method. Amortization expense for year ended December 31, 2018 and 2017 was $5.7 million and $3.0 million, respectively. The remaining weighted average life of all definite lived intangible assets as of December 31, 2018 was 11.07 years. 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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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