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Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets

The following is a summary of the Company’s intangible assets as of December 31 (in thousands, except weighted average life):
 
2019
 
2018
 
Weighted
Average Life in Years
Customer lists
$
73,678

 
$
73,792

 
13.6
Non-competition agreements
959

 
950

 
4.1
Trade names
2,510

 
2,510

 
13.3
Patents
57

 
57

 
9.0
 
77,204

 
77,309

 
 
Less accumulated amortization and impairment:
 
 
 
 
 
Customer lists
(66,382
)
 
(64,528
)
 
 
Non-competition agreements
(959
)
 
(950
)
 
 
Trade names
(2,098
)
 
(1,956
)
 
 
Patents
(51
)
 
(47
)
 
 
Total accumulated amortization and impairment
(69,490
)
 
(67,481
)
 
 
Intangible assets, net
$
7,714

 
$
9,828

 
 
Schedule of Future Amortization Expense
As of December 31, 2019, estimated amortization expense for the next five years and thereafter is as follows (in thousands):
2020
$
2,024

2021
1,784

2022
1,408

2023
962

2024
745

Thereafter
791

 
$
7,714