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Long-Term Debt Long-Term Debt (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2018
USD ($)
Dec. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
Dec. 31, 2020
USD ($)
letter_of_credit
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2020
USD ($)
Dec. 19, 2019
USD ($)
Debt Instrument [Line Items]                  
Debt Instrument, Debt Compliance, EBITDA         $ 0.50        
Letters of Credit | letter_of_credit         1        
Debt instrument, term     65 years            
Amortization of debt issuance costs         $ 782,000 $ 392,000 $ 532,000    
Line Of Credit Facility Accordion Provision         75,000,000.0        
Deferred Purchase Price Notes                  
Debt Instrument [Line Items]                  
Interest expense         $ 489,000 622,000 791,000    
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         $ 47,200,000        
Interest expense         3,738,000 1,601,000 4,351,000    
Amortization of debt issuance costs             234,000    
Term Loan [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         190,000,000.0     $ 150,000,000.0  
Letter of Credit [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         15.0        
Swingline [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         $ 10.0        
Loans Payable [Member]                  
Debt Instrument [Line Items]                  
Amortization of debt issuance costs           229,000 $ 482,000    
Revolving Credit Facility, Secured, Floating Rate                  
Debt Instrument [Line Items]                  
Present value of future deferred payments $ 2,000,000.0 $ 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)         1.50%        
Revolving Credit Facility, Secured, Floating Rate | Line of Credit | LIBOR Margin Option                  
Debt Instrument [Line Items]                  
Debt instrument interest rate (in percent)         2.50%        
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Principal amount     $ 83,800,000   $ 47,200,000 $ 83,800,000      
Line of Credit Facility, Remaining Borrowing Capacity         $ 140,700,000        
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate During Period       2.90% 3.80%        
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member]                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Gross                 $ 900,000
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member] | Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Debt instrument interest rate (in percent)         3.125%        
Ratio Actual [Member]                  
Debt Instrument [Line Items]                  
Ratio of indebtedness to net capital (in ratio)         5.50     5.75  
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 indebtedness to net capital (in ratio)         2.00        
Ratio of earnings to fixed cost obligations (in ratio)         1.20