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INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
Intangible assets consisted of the following (in thousands): 
 June 30, 2021December 31, 2020
 (unaudited)   
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Customer relationships$175,349 $(82,773)$92,576 $175,418 $(76,541)$98,877 
Non-compete agreements5,567 (5,567)— 5,569 (5,569)— 
Trade names24,819 (22,050)2,769 24,870 (21,794)3,076 
Technology7,863 (6,791)1,072 7,879 (6,691)1,188 
Licenses858 (749)109 864 (723)141 
Total$214,456 $(117,930)$96,526 $214,600 $(111,318)$103,282 
Amortization expense of intangible assets for the three months ended June 30, 2021 and June 30, 2020 was $3.6 million and $3.6 million, respectively. Amortization expense of intangible assets for the six months ended June 30, 2021 and June 30, 2020 was $7.0 million and $7.1 million, respectively. Amortization expense to be recognized for the remainder of 2021 is approximately $6 million and approximately $13 million per year from 2022 through 2025.