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Intangible and Other Non-Current Assets - Aggregate amortization expense for our intangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Noncompete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2021 $ 147  
2022 519  
2023 446  
2024 380  
2025 373  
Thereafter 499  
Total amortization expense 2,364 $ 2,785
Commissions [Member]    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2021 167  
2022 641  
2023 585  
2024 523  
2025 457  
Thereafter 1,132  
Total amortization expense $ 3,505 $ 3,141