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GOODWILL AND INTANGIBLE ASSETS
6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
A summary of the activity and balances related to goodwill by reporting segment is as follows:
December 31,
2019
AcquisitionsJune 30,
2020
Eastern region $30,720  $—  $30,720  
Western region141,055  5,147  146,202  
Resource solutions 14,044  —  14,044  
Total$185,819  $5,147  $190,966  

A summary of intangible assets by intangible asset type follows:
Covenants
Not-to-Compete
Client ListsTotal
Balance, June 30, 2020
Intangible assets$26,652  $76,635  $103,287  
Less accumulated amortization(19,756) (23,123) (42,879) 
$6,896  $53,512  $60,408  


 Covenants
Not-to-Compete
Client ListsTotal
Balance, December 31, 2019
Intangible assets$26,162  $71,122  $97,284  
Less accumulated amortization(18,968) (19,595) (38,563) 
$7,194  $51,527  $58,721  

Intangible amortization expense was $2,222 and $4,316 during the three and six months ended June 30, 2020, respectively, as compared to $1,639 and $3,039 during the three and six months ended June 30, 2019, respectively.
A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2019 and thereafter follows:
Estimated Future Amortization Expense as of June 30, 2020 
Fiscal year ending December 31, 2020$4,441  
Fiscal year ending December 31, 2021$7,500  
Fiscal year ending December 31, 2022$6,848  
Fiscal year ending December 31, 2023$6,640  
Fiscal year ending December 31, 2024$7,603  
Thereafter$27,376