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INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
Our intangible assets are as follows:
(in thousands)September 30, 2021December 31, 2020
Definite-lived intangible assets
Customer relationships$38,251 $24,862 
Unpatented technology15,514 15,713 
Patented technology3,115 2,642 
Tradename12,726 13,088 
Acquired backlog2,700 — 
All other9,413 9,262 
Gross value of definite-lived intangible assets81,719 65,567 
Customer relationships amortization(20,297)(19,537)
Unpatented technology amortization(7,935)(6,751)
Patented technology amortization(2,696)(2,593)
Tradename amortization(5,281)(4,831)
All other amortization(9,287)(9,252)
Accumulated amortization(45,496)(42,964)
Net definite-lived intangible assets $36,223 $22,603 
Indefinite-lived intangible assets
Trademarks and trade names$1,305 $1,305 
Total intangible assets, net$37,528 $23,908 
Schedule of Finite-Lived Intangible Assets
The following summarizes the changes in the carrying amount of intangible assets:
Nine months ended September 30,
(in thousands)20212020
Balance at beginning of period $23,908 $25,300 
Business acquisitions and adjustments(1)
17,100 — 
Amortization expense(2,531)(2,564)
Currency translation adjustments(949)955 
Balance at end of the period$37,528 $23,691 
(1) As described in Note 24, we are in the process of completing the purchase price allocation associated with the Fosler Construction acquisition and as a result, the increase in amortization expense associated with this acquisition is subject to change.
Schedule of Indefinite-Lived Intangible Assets
The following summarizes the changes in the carrying amount of intangible assets:
Nine months ended September 30,
(in thousands)20212020
Balance at beginning of period $23,908 $25,300 
Business acquisitions and adjustments(1)
17,100 — 
Amortization expense(2,531)(2,564)
Currency translation adjustments(949)955 
Balance at end of the period$37,528 $23,691 
(1) As described in Note 24, we are in the process of completing the purchase price allocation associated with the Fosler Construction acquisition and as a result, the increase in amortization expense associated with this acquisition is subject to change.
Schedule of Estimated Future Intangible Asset Amortization Expense
Estimated future intangible asset amortization expense, including the increase in amortization expense resulting from the September 30, 2021 acquisition of Fosler Construction, is as follows (in thousands):
Amortization Expense(1)
Year ending December 31, 2021$2,744 
Year ending December 31, 20225,633 
Year ending December 31, 20234,552 
Year ending December 31, 20244,469 
Year ending December 31, 20253,708 
Year ending December 31, 20262,452 
Thereafter12,665 
(1) As described in Note 24, we are in the process of completing the purchase price allocation associated with the Fosler Construction acquisition and as a result, the estimated future intangible asset amortization expense associated with this acquisition is subject to change.