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Goodwill and Intangibles, net | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangibles, net | 10. Goodwill and Intangibles, net Goodwill The carrying amount of goodwill by segment were as follows (in millions):
| Construction | Marine Services |  | Energy |  | Telecom |  | Insurance | Broadcasting | Total
Balance at December 31, 2018 |  | $ | 82.2 |  |  | $ | 14.3 |  |  | $ | 2.1 |  |  | $ | 4.4 |  |  | $ | 47.3 |  |  | $ | 21.4 |  |  | $ | 171.7 |
Measurement period adjustment |  | 7.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7.1 |
Impairments |  | — |  |  | — |  |  | — |  |  | (0.4 | ) |  | — |  |  | — |  |  | (0.4 | )
Balance at June 30, 2019 |  | $ | 89.3 |  |  | $ | 14.3 |  |  | $ | 2.1 |  |  | $ | 4.0 |  |  | $ | 47.3 |  |  | $ | 21.4 |  |  | $ | 178.4 |
Indefinite-lived Intangible Assets Balances of indefinite-lived intangible assets as of June 30, 2019 and December 31, 2018 were as follows (in millions):
|  | June 30, 2019 |  | December 31, 2018
FCC licenses |  | $ | 132.6 |  |  | $ | 120.6 |
State licenses |  | 2.5 |  |  | 2.5 |
Total |  | $ | 135.1 |  |  | $ | 123.1 |
In 2019, FCC licenses increased $12.0 million, $12.9 million of which was through acquisitions, offset by $0.9 million of impairments. Definite Lived Intangible Assets The gross carrying amount and accumulated amortization of amortizable intangible assets by major intangible asset class is as follows (in millions):
|  | Weighted-Average Original Useful Life |  | June 30, 2019 |  | December 31, 2018
|  |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Trade names |  | 13 Years |  | $ | 26.0 |  |  | $ | (7.0 | ) |  | $ | 19.0 |  |  | $ | 25.9 |  |  | $ | (5.9 | ) |  | $ | 20.0 |
Customer relationships |  | 10 Years |  | 53.6 |  |  | (11.5 | ) |  | 42.1 |  |  | 53.6 |  |  | (7.2 | ) |  | 46.4 |
Channel sharing arrangements |  | 40 Years |  | 25.2 |  |  | (0.5 | ) |  | 24.7 |  |  | 25.2 |  |  | — |  |  | 25.2 |
Developed technology |  | 5 Years |  | 1.2 |  |  | (1.2 | ) |  | — |  |  | 1.2 |  |  | (1.2 | ) |  | — |
Other |  | 6 Years |  | 5.5 |  |  | (1.5 | ) |  | 4.0 |  |  | 5.5 |  |  | (1.0 | ) |  | 4.5 |
Total |  |  |  | $ | 111.5 |  |  | $ | (21.7 | ) |  | $ | 89.8 |  |  | $ | 111.4 |  |  | $ | (15.3 | ) |  | $ | 96.1 |
Amortization expense for definite lived intangible assets for the three months ended June 30, 2019 and 2018 was $3.1 million and $1.1 million, respectively, and was included in Depreciation and amortization in the Condensed Consolidated Statements of Operations. Amortization expense for definite lived intangible assets for the six months ended June 30, 2019 and 2018 was $6.3 million and $2.1 million, respectively, and was included in Depreciation and amortization in the Condensed Consolidated Statements of Operations. Excluding the impact of any future acquisitions, dispositions or change in foreign currency, the Company estimates the annual amortization expense of amortizable intangible assets for the next five fiscal years will be as follows (in millions):
Fiscal Year |  | Estimated Amortization Expense
2019 |  | $ | 5.5 |
2020 |  | $ | 8.1 |
2021 |  | $ | 7.9 |
2022 |  | $ | 7.7 |
2023 |  | $ | 6.9 |

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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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