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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2020
Goodwill abstract  
Goodwill and Intangible Assets

Note 5. Goodwill and Intangible Assets

The following table presents changes in goodwill, all of which has been allocated to the GDSO segment (in thousands):

Balance at December 31, 2019

$

324,474

Dispositions (1)

(909)

Balance at December 31, 2020

$

323,565

(1)Dispositions represent derecognition of goodwill associated with the sale and disposition of certain assets (see Note 7).

Intangible assets consisted of the following (in thousands):

Gross

Net

Carrying

Accumulated

Intangible

Amortization

Amount

Amortization

Assets

Period

At December 31, 2020

Intangible assets subject to amortization:

Terminalling services

$

26,365

$

(17,765)

$

8,600

 

20 years

Customer relationships

 

43,986

 

(42,065)

 

1,921

 

2-15 years

Supply contracts

 

87,578

 

(62,881)

 

24,697

 

5-15 years

Other intangible assets

 

5,195

 

(4,488)

 

707

 

3-20 years

Total intangible assets

$

163,124

$

(127,199)

$

35,925

At December 31, 2019

Intangible assets subject to amortization:

Terminalling services

$

26,365

$

(16,429)

$

9,936

 

20 years

Customer relationships

 

43,986

 

(41,630)

 

2,356

 

2-15 years

Supply contracts

 

87,578

 

(54,655)

 

32,923

 

5-15 years

Other intangible assets

 

5,195

 

(3,645)

 

1,550

 

3-20 years

Total intangible assets

$

163,124

$

(116,359)

$

46,765

The aggregate amortization expense was approximately $10.8 million, $11.4 million and $11.0 million for the years ended December 31, 2020, 2019 and 2018, respectively.

The estimated annual intangible asset amortization expense for future years ending December 31 is as follows (in thousands):

2021

    

$

10,434

2022

 

7,200

2023

 

6,768

2024

 

5,101

2025

 

2,620

Thereafter

 

3,802

Total intangible assets

$

35,925