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INTANGIBLE ASSETS (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Intangible Assets by Intangible Asset Type
A summary of intangible assets by intangible asset type follows:
 
Covenants
Not-to-Compete
 
Client Lists
 
Total
Balance, March 31, 2019
 
 
 
 
 
Intangible assets
$
21,750

 
$
44,363

 
$
66,113

Less accumulated amortization
(17,820
)
 
(14,927
)
 
(32,747
)
 
$
3,930

 
$
29,436

 
$
33,366

 
Covenants
Not-to-Compete
 
Client Lists
 
Total
Balance, December 31, 2018
 
 
 
 
 
Intangible assets
$
21,750

 
$
44,363

 
$
66,113

Less accumulated amortization
(17,584
)
 
(13,762
)
 
(31,346
)
 
$
4,166

 
$
30,601

 
$
34,767
Summary of Intangible Amortization Expense Estimated
A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2018 and thereafter follows:
Estimated Future Amortization Expense as of March 31, 2019
 
Fiscal year ending December 31, 2019
$
4,200

Fiscal year ending December 31, 2020
$
4,997

Fiscal year ending December 31, 2021
$
4,094

Fiscal year ending December 31, 2022
$
3,534

Fiscal year ending December 31, 2023
$
3,231

Thereafter
$
13,310