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Goodwill and Intangibles, net (Tables)
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of the Changes in the Carrying Amount of Goodwill by Reporting Unit
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

Schedule of 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

Schedule of Intangible Assets Subject to Amortization
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
 
 
 
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

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
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