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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets |
Goodwill and Intangible Assets | 8. Goodwill and Intangible Assets Goodwill and intangible assets consisted of the following at December 31:
|  | 2019 |  | 2018
|  | Gross |  |  |  |  | Net |  | Gross |  |  |  |  | Net
|  | Carrying |  | Accumulated |  | Carrying |  | Carrying |  | Accumulated |  | Carrying
(in thousands) |  | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
T&D |  | $ | 40,224 |  | $ | — |  | $ | 40,224 |  | $ | 40,224 |  | $ | — |  | $ | 40,224
C&I |  |  | 25,836 |  |  | — |  |  | 25,836 |  |  | 16,364 |  |  | — |  |  | 16,364
Total goodwill |  | $ | 66,060 |  | $ | — |  | $ | 66,060 |  | $ | 56,588 |  | $ | — |  | $ | 56,588
Amortizable Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Backlog |  | $ | 5,289 |  | $ | 4,039 |  | $ | 1,250 |  | $ | 2,789 |  | $ | 1,889 |  | $ | 900
Customer relationships |  |  | 31,381 |  |  | 6,623 |  |  | 24,758 |  |  | 17,280 |  |  | 4,970 |  |  | 12,310
Trade names |  |  | 695 |  |  | 218 |  |  | 477 |  |  | 695 |  |  | 172 |  |  | 523
Indefinite-lived Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 28,455 |  |  | — |  |  | 28,455 |  |  | 19,533 |  |  | — |  |  | 19,533
Total intangible assets |  | $ | 65,820 |  | $ | 10,880 |  | $ | 54,940 |  | $ | 40,297 |  | $ | 7,031 |  | $ | 33,266
The increase in goodwill as of December 31, 2019 compared to December 31, 2018 was primarily due to the allocation of $9.5 million of goodwill related to the acquisition of CSI identified during the ongoing analysis of the purchase accounting. The increase in intangible assets also related to the acquisition of CSI and are being amortized on a straight-line basis over periods ranging up to 12 years. Additional financial information related to this acquisition is provided in Note 2 –Acquisitions to the Financial Statements. Immaterial foreign currency translation adjustments related to goodwill and intangible assets are netted with the amounts indicated above. Customer relationships and backlog are being amortized on a straight-line method over an estimated useful life ranging up to 12.5 years and the remaining life of the contract, respectively, and have been determined to have no residual value. Amortizable trade names are being amortized on a straight-line basis over an estimated useful life of approximately 15 years. Certain trade names have indefinite lives and, therefore, are not being amortized. Intangible asset amortization expense was $3.8 million, $1.8 million and $0.5 million for the years ended December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, estimated future intangible asset amortization expense for the each of the next five years and thereafter was as follows:
|  | Future
|  | Amortization
(in thousands) |  | Expense
2020 |  | $ | 3,587
2021 |  |  | 2,312
2022 |  |  | 2,312
2023 |  |  | 2,312
2024 |  |  | 2,312
Thereafter |  |  | 13,650
Total |  | $ | 26,485

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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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