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Goodwill and Intangibles | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangibles | NOTE 6 – GOODWILL AND INTANGIBLES Goodwill The change in carrying amount of goodwill was as follows (in thousands):
|  | Goodwill (Gross) |  |  | Accumulated Impairment Losses |  |  | Goodwill (Net) |
January 1, 2017 |  | $ | 177,090 |  |  | $ | (70,004 | ) |  | $ | 107,086 |
Business combinations |  |  | 47,727 |  |  |  | — |  |  |  | 47,727 |
Other |  |  | 653 |  |  |  | — |  |  |  | 653 |
December 31, 2017 |  |  | 225,470 |  |  |  | (70,004 | ) |  |  | 155,466 |
Business combinations |  |  | 17,023 |  |  |  | — |  |  |  | 17,023 |
Other |  |  | 560 |  |  |  | — |  |  |  | 560 |
December 31, 2018 |  | $ | 243,053 |  |  | $ | (70,004 | ) |  | $ | 173,049 |
Other changes included in the above table for the years ended December 31, 2018 and 2017 include minor adjustments for the allocation of certain acquisitions still under measurement as well as several immaterial tuck-in acquisitions. For additional information regarding changes to goodwill resulting from acquisitions, see Note 15, Business Combinations. At October 1, 2018, our measurement date, we performed a qualitative analysis that weighed all evidence of potential impairment, whether positive or negative, and determined that no factors existed that indicated an impairment of goodwill more likely than not existed. As such, no impairment of goodwill was recognized for the year ended December 31, 2018. In addition, no impairment of goodwill was recognized for the years ended December 31, 2017 or 2016. Intangibles, net The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):
|  | As of December 31, |
|  | 2018 |  |  | 2017 |
|  | Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
|  | Carrying |  |  | Accumulated |  |  | Book |  |  | Carrying |  |  | Accumulated |  |  | Book |
|  | Amount |  |  | Amortization |  |  | Value |  |  | Amount |  |  | Amortization |  |  | Value |
Amortized intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 148,635 |  |  | $ | 52,514 |  |  | $ | 96,121 |  |  | $ | 121,015 |  |  | $ | 38,651 |  |  | $ | 82,364 |
Covenants not-to-compete |  |  | 14,682 |  |  |  | 7,572 |  |  |  | 7,110 |  |  |  | 11,807 |  |  |  | 4,773 |  |  |  | 7,034 |
Trademarks and tradenames |  |  | 64,432 |  |  |  | 18,256 |  |  |  | 46,176 |  |  |  | 58,136 |  |  |  | 14,076 |  |  |  | 44,060 |
Backlog |  |  | 14,060 |  |  |  | 13,677 |  |  |  | 383 |  |  |  | 13,600 |  |  |  | 9,067 |  |  |  | 4,533 |
|  | $ | 241,809 |  |  | $ | 92,019 |  |  | $ | 149,790 |  |  | $ | 204,558 |  |  | $ | 66,567 |  |  | $ | 137,991 |
There was no intangible asset impairment loss for the years ended December 31, 2018, 2017 and 2016. The gross carrying amount of intangibles increased approximately $37.3 million and $77.7 million during the years ended December 31, 2018 and 2017, respectively. Intangibles associated with business combinations accounted for approximately $36.1 million and $76.8 million of the increases during the years ended December 31, 2018 and 2017, respectively, with the remaining changes due to other factors. For more information, see Note 15, Business Combinations. Amortization expense on intangible assets totaled approximately $25.4 million, $26.9 million and $11.3 million during the years ended December 31, 2018, 2017 and 2016, respectively. Remaining estimated aggregate annual amortization expense is as follows (in thousands):
2019 |  | $ | 23,250 |
2020 |  |  | 22,318 |
2021 |  |  | 21,012 |
2022 |  |  | 20,094 |
2023 |  |  | 17,183 |
Thereafter |  |  | 45,933 |

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