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GOODWILL AND OTHER INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS
The following table presents the changes in the carrying amount of goodwill and other intangible assets during the year ended December 31, 2021 (in thousands):
 GoodwillOther
Intangible
Assets		Total
Balances as of December 31, 2020$261,767 $80,088 $341,855 
Translation adjustment— 55 55 
Acquisitions 46,739 16,259 62,998 
Amortization— (17,197)(17,197)
Balances as of December 31, 2021$308,506 $79,205 $387,711 
 
The following table presents the changes in the carrying amount of goodwill and other intangible assets during the year ended December 31, 2020 (in thousands):
 GoodwillOther
Intangible
Assets		Total
Balances as of December 31, 2019$194,052 $52,582 $246,634 
Translation adjustment— (4)(4)
Acquisitions104,150 39,797 143,947 
Impairment(36,435)— (36,435)
Amortization— (12,287)(12,287)
Balances as of December 31, 2020$261,767 $80,088 $341,855 
The following table presents the goodwill balance by reportable segment as of December 31, 2021 and 2020 (in thousands):
As of December 31,
 20212020
Service Centers$251,336 $244,628 
Innovative Pumping Solutions40,031 — 
Supply Chain Services17,139 17,139 
Total$308,506 $261,767 

The following table presents a summary of other intangible assets ( in thousands):
 As of December 31, 2021As of December 31, 2020
 Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Amount,
net		Gross
Carrying
Amount		Accumulated
Amortization		Carrying
Amount,
net
Customer relationships$208,966 $(132,555)$76,411 $193,747 $(116,028)$77,719 
Non-compete agreements3,657 (863)2,794 2,617 (248)2,369 
Total$212,623 $(133,418)$79,205 $196,364 $(116,276)$80,088 
 
Gross carrying amounts as well as accumulated amortization are partially affected by the fluctuation of foreign currency rates. Other intangible assets are amortized according to estimated economic benefits over their estimated useful lives.

Customer relationships are amortized over their estimated useful lives. Amortization expense is recognized according to estimated economic benefits and was $17.2 million, $12.3 million, and $15.1 million for the years ended December 31, 2021, 2020, and 2019, respectively. The estimated future annual amortization of intangible assets for each of the next five years and thereafter are as follows (in thousands):

2022$16,917 
202314,951 
202412,681 
202511,125 
20268,824 
Thereafter14,707 
Total$79,205 

The weighted average remaining estimated life for customer relationships and non-compete agreements are 6.6 years and 4.1 years, respectively.