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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
A summary of intangible assets as of December 31, 2020 and 2019 is as follows (in thousands):
 
 December 31, 2020
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Customer relationships$175,418 $(76,541)$98,877 
Non-compete agreements5,569 (5,569)— 
Trade names24,870 (21,794)3,076 
Technology7,879 (6,691)1,188 
Licenses864 (723)141 
Total$214,600 $(111,318)$103,282 
 
 December 31, 2019
Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Customer relationships$174,940 $(63,727)$111,213 
Non-compete agreements5,466 (5,306)160 
Trade names24,724 (21,146)3,578 
Technology7,838 (5,976)1,862 
Licenses848 (642)206 
Total$213,816 $(96,797)$117,019 
Amortization expense on intangible assets for the years ended December 31, 2020, 2019 and 2018 was $14.0 million, $14.3 million and $28.7 million, respectively. Amortization expense for current intangible assets is forecast to be approximately $13 million per year from 2021 through 2024.
The decline in amortization expense in 2019 is primarily due to a change in the estimated useful life of an intangible asset associated with the Furmanite trade name in 2018. Management determined that, as a result of initiatives to consolidate our branding, the useful life of this intangible asset was not expected to extend beyond December 31, 2018. In accordance with ASC 350, we accounted for the change in useful life prospectively effective January 1, 2018 and amortized the remaining balance over 2018, which resulted in incremental amortization expense in 2018 of $12 million which did not recur in 2019.
The weighted-average amortization period for intangible assets subject to amortization was 13.6 years as of December 31, 2020. The weighted-average amortization period as of December 31, 2020 is 13.6 years for customer relationships, 5.0 years for non-compete agreements, 15.0 years for trade names, 10.0 years for technology and 10.5 years for licenses.