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INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
A summary of intangible assets as of June 30, 2022 and December 31, 2021 is as follows (in thousands): 
 June 30, 2022December 31, 2021
 (unaudited)   
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Customer relationships$174,774 $(94,627)$80,147 $175,156 $(88,783)$86,373 
Non-compete agreements5,411 (5,411)— 5,503 (5,503)— 
Trade names24,614 (22,432)2,182 24,743 (22,252)2,491 
Technology7,809 (6,966)843 7,843 (6,885)958 
Licenses837 (793)44 850 (774)76 
Total$213,445 $(130,229)$83,216 $214,095 $(124,197)$89,898 

Amortization expense of intangible assets for the three months ended June 30, 2022 and June 30, 2021 was $3.4 million and $3.6 million, respectively. Amortization expense of intangible assets for the six months ended June 30, 2022 and June 30, 2021 was $6.8 million and $7.0 million, respectively. Amortization expense for intangible assets is forecast to be approximately $13.1 million per year from 2022 through 2025.
The weighted-average amortization period for intangible assets subject to amortization was 13.7 years as of June 30, 2022 and December 31, 2021.