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GOODWILL AND OTHER INTANGIBLE ASSETS, NET
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS, NET GOODWILL AND OTHER INTANGIBLE ASSETS, NET
Changes in the carrying amount of goodwill were as follows:
Dispensing and Specialty ClosuresMetal
Containers		Custom
Containers		Total
 (Dollars in thousands)
Balance at December 31, 2019$801,776 $113,463 $226,984 $1,142,223 
Acquisitions515,595 — — 515,595 
Currency translation78,820 4,475 383 83,678 
Balance at December 31, 20201,396,191 117,938 227,367 1,741,496 
Acquisitions350,737 12,852 — 363,589 
Currency translation(62,231)(4,598)152 (66,677)
Balance at December 31, 2021$1,684,697 $126,192 $227,519 $2,038,408 
The components of other intangible assets, net at December 31 were as follows:
 20212020
 Gross
Amount		Accumulated
Amortization		Gross
Amount		Accumulated
Amortization
 (Dollars in thousands)
Definite-lived intangibles:
Customer relationships$929,060 $(174,377)$711,065 $(147,014)
Other82,697 (38,748)72,689 (31,672)
1,011,757 (213,125)783,754 (178,686)
Indefinite-lived intangibles:
Trade names32,140 — 32,140 — 
$1,043,897 $(213,125)$815,894 $(178,686)
In connection with our acquisitions of Silgan Specialty Packaging, Unicep and Easytech as discussed in Note 3, we recognized intangible assets for customer relationships of $246.1 million, technology know-how of $8.6 million and trade names of $4.8 million.
Amortization expense in 2021, 2020 and 2019 was $44.6 million, $36.2 million and $27.1 million, respectively. Amortization expense is expected to be $53.8 million, $53.8 million, $50.4 million, $49.6 million and $48.4 million for the years ended December 31, 2022 through 2026, respectively.