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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Intangible Assets    
Intangible asset impairment charge $ 0 $ 0
Weighted Average Life 15 years 8 months 12 days  
Intangible amortization expense $ 4,595,000 4,635,000
Intangible assets subject to amortization, Gross Book Value 65,885,000 65,885,000
Intangible assets subject to amortization, Accumulated Amortization (39,678,000) (35,083,000)
Intangible assets subject to amortization, Net Book Value $ 26,207,000 30,802,000
Customer relationships    
Intangible Assets    
Weighted Average Life 17 years 2 months 12 days  
Intangible assets subject to amortization, Gross Book Value $ 55,454,000 55,454,000
Intangible assets subject to amortization, Accumulated Amortization (32,141,000) (28,865,000)
Intangible assets subject to amortization, Net Book Value $ 23,313,000 26,589,000
Technology and software    
Intangible Assets    
Weighted Average Life 8 years  
Intangible assets subject to amortization, Gross Book Value $ 7,101,000 7,101,000
Intangible assets subject to amortization, Accumulated Amortization (5,881,000) (4,952,000)
Intangible assets subject to amortization, Net Book Value $ 1,220,000 2,149,000
Trademarks    
Intangible Assets    
Weighted Average Life 8 years 8 months 12 days  
Intangible assets subject to amortization, Gross Book Value $ 3,330,000 3,330,000
Intangible assets subject to amortization, Accumulated Amortization (1,656,000) (1,266,000)
Intangible assets subject to amortization, Net Book Value $ 1,674,000 $ 2,064,000