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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETSThe Company had goodwill in the amount of $529,463 and $523,998 as of December 31, 2020 and 2019, respectively, subject to the provisions of ASC 350, “Intangibles-Goodwill and Other.” The increase in goodwill is primarily due to foreign exchange translation adjustments and an adjustment related to the Zumbro acquisition, partially offset by an impairment of $1,228 related to business formerly included in the Industrial Products segment.
As of December 31, 2020 and 2019, the Company had identifiable intangible assets as follows:
20202019
 Amortization
Period
(In years)		Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount
Accumulated
Amortization
Customer relationships & lists
10-20
$243,557 $158,051 $239,578 $139,863 
Trademarks & trade names
2-17
43,208 24,974 43,102 20,477 
Developed technology
5-12
21,674 13,693 20,206 11,008 
Other
3-18
21,624 11,685 20,962 8,576 
  $330,063 $208,403 $323,848 $179,924 

Amortization of identifiable intangible assets was $27,811, $25,789 and $24,988 for 2020, 2019 and 2018, respectively. Assuming no change in the gross carrying value of identifiable intangible assets, the estimated amortization expense is approximately $24,392 in 2021, $22,430 in 2022, $19,501 in 2023, $10,800 in 2024, and $6,540 in 2025. At December 31, 2020 and 2019, there were no identifiable intangible assets with indefinite useful lives as defined by ASC 350, “Intangibles-Goodwill and Other.” Identifiable intangible assets are reflected in the Company’s consolidated balance sheets under Intangible assets with finite lives, net. There were no changes to the useful lives of intangible assets subject to amortization in 2020 and 2019.

The Federal Insecticide, Fungicide and Rodenticide Act, (“FIFRA”), a health and safety statute, requires that certain products within our specialty products segment must be registered with the U.S. Environmental Protection Agency (the "EPA") because they are considered pesticides. Costs of such registrations are included as other in the table above.