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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | Intangible Assets and Goodwill The following tables summarize the intangible assets subject to amortization for the years ended December 31, 2018 and December 31, 2017.
| 2018 |  |  |  |  |  |
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands) |  |  |  |
Customer relationships | 20 |  | 13,600 |  | 2,329 |  | $ | 11,271
Tradename | 0.5-6 |  | 8,100 |  | 7,021 |  | 1,079
Covenants not to compete | 1-10 |  | 4,200 |  | 2,056 |  | 2,144
|  |  | $ | 25,900 |  | $ | 11,406 |  | $ | 14,494
| 2017 |  |  |  |  |  |
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands) |  |  |  |
Customer relationships | 20 |  | 13,600 |  | 1,645 |  | $ | 11,955
Tradename | 0.5-6 |  | 8,100 |  | 5,769 |  | 2,331
Covenants not to compete | 1-10 |  | 4,200 |  | 1,464 |  | 2,736
|  |  | $ | 25,900 |  | $ | 8,878 |  | $ | 17,022
Amortization expense for the twelve months ended December 31, 2018 and 2017 was $2.5 million and $2.9 million, respectively, and was included in depreciation and amortization in the consolidated statements of comprehensive income. Future amortization expense for intangible assets is estimated at $2.3 million for 2019, $1.2 million for 2020, $1.2 million for 2021, and $1.1 million for 2022, and $1.0 million for 2023. Changes in carrying amount of goodwill during the twelve months ended December 31, 2018 and December 31, 2017 were as follows:
| (in thousands)
Balance at December 31, 2016 | $ | 100,212
Acquisition | 32,198
Balance at December 31, 2017 | $ | 132,410
Acquisition | —
Balance at December 31, 2018 | $ | 132,410

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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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