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INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
Intangible assets consisted of the following (in thousands): 
 September 30, 2021December 31, 2020
 (unaudited)   
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Customer relationships$175,214 $(85,736)$89,478 $175,418 $(76,541)$98,877 
Non-compete agreements5,519 (5,519)— 5,569 (5,569)— 
Trade names24,776 (22,134)2,642 24,870 (21,794)3,076 
Technology7,852 (6,837)1,015 7,879 (6,691)1,188 
Licenses854 (761)93 864 (723)141 
Total$214,215 $(120,987)$93,228 $214,600 $(111,318)$103,282 
Amortization expense of intangible assets for the three months ended September 30, 2021 and September 30, 2020 was $3.4 million and $3.6 million, respectively. Amortization expense of intangible assets for the nine months ended September 30, 2021 and September 30, 2020 was $10.5 million and $10.9 million, respectively. Amortization expense to be recognized for the remainder of 2021 is approximately $3 million and approximately $13 million per year from 2022 through 2025.