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Goodwill and Related Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Related Intangible Assets GOODWILL AND RELATED INTANGIBLE ASSETS
Goodwill
The changes in the carrying amount of goodwill for the years ended December 31 were as follows (in thousands):
RenewablesResidentialAgtechInfrastructureTotal
Balance at December 31, 2019$44,816 $198,075 $32,786 $31,678 $307,355 
Acquired goodwill147,004 7,377 50,862 — 205,243 
Adjustments to prior year acquisitions— — 578 — 578 
Foreign currency translation707 — 396 — 1,103 
Balance at December 31, 2020$192,527 $205,452 $84,622 31,678 $514,279 
Adjustments to prior year acquisitions(2,433)— 323 — (2,110)
Foreign currency translation(1,414)— 187 — (1,227)
Balance at December 31, 2021$188,680 $205,452 $85,132 31,678 $510,942 
Goodwill is recognized net of accumulated impairment losses of $133.2 million as of December 31, 2021 and 2020, respectively. No goodwill impairment charges were recognized by the Company during 2021 or 2020.
Annual and Interim Impairment Testing
The Company tests goodwill and indefinite-lived intangible assets for impairment on an annual basis as of October 31 and at interim dates when indicators of impairment are present. In 2021, 2020 and 2019, no indicators of impairment were identified as of interim dates; therefore, no interim tests were performed.

During the October 31, 2021 impairment test, the Company conducted a quantitative analysis for all eight of the Company’s reporting units. The quantitative impairment test consists of comparing the fair value of a reporting unit with its carrying value including goodwill. The fair value of each reporting unit evaluated under the quantitative test was determined using two valuation techniques: an income approach and a market approach. Each valuation approach relies on significant assumptions including a weighted average cost of capital ("WACC") based upon the capital structure of market participants in the Company’s peer groups, projected revenue growth, forecasted cash flows, and earnings multiples based on the market value of the Company and market participants within its peer groups.
As a result of the Company's annual testing for 2021, 2020 and 2019, none of the reporting units with goodwill as of the testing date had carrying values in excess of their fair values.
Acquired Intangible Assets
Acquired intangible assets consist of the following (in thousands):
 December 31, 2021December 31, 2020
 Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Indefinite-lived intangible assets:
Trademarks$52,700 $— $56,570 $— 
Finite-lived intangible assets:
Trademarks5,521 4,011 5,818 3,385 
Unpatented technology38,474 20,656 38,752 17,765 
Customer relationships108,591 39,832 98,500 31,580 
Non-compete agreements2,686 1,969 4,885 1,747 
Backlog7,200 7,200 7,228 911 
162,472 73,668 155,183 55,388 
Total acquired intangible assets$215,172 $73,668 $211,753 $55,388 

During the year ended December 31, 2021, the Company recognized impairment charges of $8.3 million related to indefinite-lived trademark intangible assets due to a rebranding initiative that resulted in the discontinuation of certain indefinite-lived trademarks in the Company's Agtech segment. The Company did not recognize impairment charges related to indefinite-lived trademark intangible assets for the year ended December 31, 2020.

The Company recognized amortization expense related to the definite-lived intangible assets. The following table summarizes amortization expense for the years ended December 31 (in thousands):

202120202019
Amortization expense$18,856 $9,663 $6,891 

Amortization expense related to acquired intangible assets for the next five years ended December 31 is estimated as follows (in thousands):
20222023202420252026
Amortization expense$12,124 $11,195 $11,014 $10,780 $9,161