10. Goodwill and Intangibles, net

Goodwill

The changes in the carrying amount of goodwill by segment were as follows (in thousands):



	Construction			Marine Services		Energy		Telecom		Insurance		Life Sciences			Broadcasting			Other			Total
Balance at December 31, 2017		$	38,607	$	14,251	$	2,122	$	3,378	$	47,290	$	3,620			$	20,678	$	1,795		$	131,741
Measurement period adjustment		—		—		—		—		—		—				725		—			725
Disposition		—		—		—		—		—		(3,620		)		—		(1,795		)	(5,415		)
Balance at September 30, 2018		$	38,607	$	14,251	$	2,122	$	3,378	$	47,290	$	—			$	21,403	$	—		$	127,051

An interim goodwill impairment evaluation was performed on each reporting unit as of September 30, 2018. After considering all quantitative and qualitative factors, the Company has determined that it is more likely than not that the reporting units' fair values exceed carrying values as of the period end.

Through the sale of BeneVir in the second quarter of 2018, $3.6 million of goodwill was deconsolidated. See Note 4. Acquisitions, Dispositions, and Deconsolidations, for additional detail regarding our acquisitions and dispositions.

Through the deconsolidation of 704Games in the third quarter of 2018, $1.8 million of goodwill was deconsolidated. See Note 4. Acquisitions, Dispositions, and Deconsolidations, for additional detail regarding our acquisitions and dispositions.

Indefinite-lived Intangible Assets

Balances of indefinite-lived intangible assets as of September 30, 2018 and December 31, 2017 were as follows (in thousands):



	September 30, 2018		December 31, 2017
State licenses	$	2,450	$	2,450
FCC licenses and Channel share arrangements	119,981		76,490
Developed technology	—		6,392
Total	$	122,431	$	85,332

Through the sale of BeneVir, $6.4 million of developed technology were sold to a third party. See Note 4. Acquisitions, Dispositions, and Deconsolidations for additional detail regarding our acquisitions and dispositions.

The Broadcasting segment strategically acquires assets across the United States, which results in the recording of FCC licenses. Providing the Company acts within the requirements and constraints of the regulatory authorities, the renewal and extension of these licenses is reasonably certain at minimal costs. Accordingly, we have concluded that the acquired FCC licenses are indefinite-lived intangible assets.

In 2018, FCC licenses and channel sharing arrangements increased $43.5 million, $44.2 million through acquisitions, offset by $0.6 million of measurement period adjustments and $0.1 million of impairments, driven by licenses dismissed by the FCC.

Definite Lived Intangible Assets

The gross carrying amount and accumulated amortization of amortizable intangible assets by major intangible asset class is as follows:



	Weighted-Average Original Useful Life	September 30, 2018							December 31, 2017
	Weighted-Average Original Useful Life	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Trade names	11 Years	$	13,981	$	(5,484	)	$	8,497	$	13,981	$	(4,527	)	$	9,454
Customer relationships	12 Years	21,657		(6,137		)	15,520		21,657		(4,681		)	16,976
Developed technology	5 Years	1,184		(1,184		)	—		3,823		(3,601		)	222
Other	4 Years	5,444		(841		)	4,603		5,374		(253		)	5,121
Total		$	42,266	$	(13,646	)	$	28,620	$	44,835	$	(13,062	)	$	31,773

Amortization expense for definite lived intangible assets for the three months ended September 30, 2018 and 2017 was $1.1 million and $1.4 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 nine months ended September 30, 2018 and 2017 was $3.2 million and $4.1 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:



Fiscal Year	Estimated Amortization Expense
2019	$	3,907
2020	$	3,771
2021	$	3,545
2022	$	3,448
2023	$	3,320