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Long-Term Debt Long-Term Debt (Narrative) (Details)
 12 Months Ended
Sep. 01, 2021
USD ($)
May 13, 2021
USD ($)
Sep. 29, 2020
USD ($)
May 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
letter_of_credit
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 22, 2021
USD ($)
Debt Instrument [Line Items]                
Present value of future deferred payments     $ 2,100,000          
Debt Instrument, Debt Compliance, EBITDA         0.50      
Letters of Credit | letter_of_credit         1      
Debt instrument, term         89 months      
Amortization of debt issuance costs         $ 576,000 $ 782,000 $ 392,000  
Debt Issuance Costs, Gross   $ 800,000            
Line Of Credit Facility Accordion Provision         75,000,000 75,000,000    
Gain (Loss) on Extinguishment of Debt         (23,807,000) (6,000) 0  
Debt Issuance Costs, Net         1,543,000 1,136,000    
Deferred Purchase Price Notes                
Debt Instrument [Line Items]                
Interest expense         $ 364,000 489,000 622,000  
Deferred Purchase Price Notes | Minimum                
Debt Instrument [Line Items]                
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent)         7.30%      
Debt instrument, term         5 years      
Deferred Purchase Price Notes | Maximum                
Debt Instrument [Line Items]                
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent)         10.00%      
Debt instrument, term         20 years      
Credit Agreement [Member]                
Debt Instrument [Line Items]                
Principal amount         $ 155,400,000      
Interest expense         $ 1,820,000 3,738,000 1,601,000  
Amortization of debt issuance costs             229,000  
Gain (Loss) on Extinguishment of Debt   100,000            
Term Loan [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity           190,000,000    
Letter of Credit [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity           15,000,000.0    
Swingline [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity           10,000,000.0    
Loans Payable [Member]                
Debt Instrument [Line Items]                
Amortization of debt issuance costs           482,000 $ 380,000  
Credit Agreement Amendment                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity               $ 200,000,000
Debt Issuance Costs, Net               $ 100,000
New Term Loan                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity   150,000,000            
Revolving Credit Facility, Secured, Floating Rate                
Debt Instrument [Line Items]                
Present value of future deferred payments $ 2,300,000     $ 2,100,000        
Revolving Credit Facility, Secured, Floating Rate | Line of Credit | Prime Rate Option                
Debt Instrument [Line Items]                
Debt instrument interest rate (in percent)         0.75%      
Revolving Credit Facility, Secured, Floating Rate | Line of Credit | LIBOR Margin Option                
Debt Instrument [Line Items]                
Debt instrument interest rate (in percent)         1.75%      
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Principal amount         $ 155,400,000 $ 47,200,000    
Line of Credit Facility, Remaining Borrowing Capacity   $ 21,400,000     $ 42,300,000      
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Credit Agreement [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate During Period         2.40% 3.80%    
Ratio Actual [Member]                
Debt Instrument [Line Items]                
Ratio of indebtedness to net capital (in ratio)         5.00      
Ratio Actual [Member] | Minimum                
Debt Instrument [Line Items]                
Ratio of indebtedness to net capital (in ratio)         0.25      
Ratio Actual [Member] | Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Ratio of earnings to fixed cost obligations (in ratio)         1.20