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Goodwill and Intangible Assets (Q3) (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Schedule of Finite-Lived Intangible Assets

The gross carrying values, accumulated amortization, and net carrying values (reduced for fully amortized intangibles) of finite-lived intangible assets as of September 30, 2021 and December 31, 2020 are as follows (in thousands):
 
   
September 30, 2021
  
   
Gross Carrying
Value
    
Accumulated Amortization
    
Net Carrying Value
  
Customer relationships
  
$
9,690
    
$
(3,118
)
  
$
6,572
  
Non-compete agreements
    
1,430
      
(845
)
    
585
  
Trademarks and trade names
    
160
      
(67
)
    
93
  
Technology
    
1,540
      
(764
)
    
776
  
Total
  
$
12,820
    
$
(4,794
)
  
$
8,026
  
 
   
December 31, 2020
  
   
Gross Carrying
Value
    
Accumulated Amortization
    
Net Carrying Value
  
Customer relationships
  
$
16,350
    
$
(8,698
)
  
$
7,652
  
Non-compete agreements
    
1,460
      
(660
)
    
800
  
Trademarks and trade names
    
160
      
(47
)
    
113
  
Technology
    
1,540
      
(571
)
    
969
  
Total
  
$
19,510
    
$
(9,976
)
  
$
9,534
  

The weighted average useful life, gross carrying value, accumulated amortization, and net carrying value of intangible assets as of December 31, 2020 and 2019 are as follows:


​
December 31, 2020
  
​
Weighted
Average
Useful Life
  
Gross
Carrying
Value
    
Accumulated
amortization
    
Net
  
Customer relationships
12.2 years
  
$
16,350
    
$
(8,698
)
  
$
7,652
  
Non-compete agreements
5.0 years
    
1,460
      
(660
)
    
800
  
Trademarks and trade names
6.0 years
    
160
      
(47
)
    
113
  
Technology
6.0 years
    
1,540
      
(571
)
    
969
  
Total
​
  
$
19,510
    
$
(9,976
)
  
$
9,534
  

​
December 31, 2019
  
​
Weighted
Average
Useful Life
  
Gross
Carrying
Value
    
Accumulated
amortization
    
Net
  
Customer relationships
11.4 years
  
$
21,340
    
$
(12,037
)
  
$
9,303
  
Non-compete agreements
5.4 years
    
1,860
      
(768
)
    
1,092
  
Trademarks and trade names
6.6 years
    
350
      
(210
)
    
140
  
Technology
6.0 years
    
4,724
      
(3,499
)
    
1,225
  
Total
​
  
$
28,274
    
$
(16,514
)
  
$
11,760
  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Estimated amortization expense for each of the next five years and thereafter is as follows (in thousands):
 
2021 (remainder)
  
$
317
  
2022
    
1,269
  
2023
    
1,174
  
2024
    
930
  
2025
    
737
  
Thereafter
    
3,599
  
Total
  
$
8,026
  

Estimated amortization expense for the next five years and thereafter as of December 31, 2020 is as follows:


2021
  
$
1,825
  
2022
    
1,269
  
2023
    
1,174
  
2024
    
930
  
2025
    
737
  
Thereafter
    
3,599
  
Total
  
$
9,534