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Intangible and Other Non-Current Assets (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
divestiture
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Other Assets, Noncurrent $ 21       $ 51
Deferred Costs and Other Assets 29,502       29,542
Amortization of deferred financing costs 193   $ 200    
Amortization of Intangible Assets 320   328    
Amortization of capitalized commissions and non-compete agreements 152   141    
Accumulated Amortization of Other Deferred Costs $ 1,746       1,594
Number of Businesses Sold | divestiture 2        
Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Service Contract, Term 8 years        
Maximum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Service Contract, Term 10 years     10 years  
Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Other Assets, Noncurrent $ 23,565       23,565
Commissions [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Net 3,240       3,141
Noncompete Agreements [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Net 2,676       2,785
Finite-Lived Intangible Assets, Accumulated Amortization 3,361       $ 3,193
Amortization of Intangible Assets $ 168   187    
Noncompete Agreements [Member] | Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Service Contract, Term 1 year        
Noncompete Agreements [Member] | Maximum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Service Contract, Term 10 years        
Credit Agreement 2018 [Member] | Revolving Credit Facility [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of deferred financing costs   $ 118 $ 126