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Long-Term Debt Long-Term Debt (Narrative) (Details)
 6 Months Ended 12 Months Ended
Dec. 24, 2018
USD ($)
May 31, 2018
USD ($)
Jun. 30, 2018
Dec. 31, 2019
USD ($)
letter_of_credit
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2020
Mar. 31, 2020
Dec. 19, 2019
USD ($)
Sep. 30, 2019
USD ($)
Nov. 08, 2018
USD ($)
Mar. 19, 2014
Debt Instrument [Line Items]                        
Debt Instrument, Debt Compliance, EBITDA       $ 0.50                
Principal amount       $ 90,764,000                
Letters of Credit | letter_of_credit       1                
Repayments of Long-term Lines of Credit       $ 118,261,000 $ 189,400,000 $ 82,600,000            
Debt instrument, term       77 months                
Net loss on early extinguishment of debt       $ 0 502,000 0            
Amortization of debt issuance costs       392,000 532,000 820,000            
Convertible subordinated notes                        
Debt Instrument [Line Items]                        
Principal amount       $ 6,319,000 6,346,000              
Debt instrument interest rate (in percent)                       2.75%
Debt instrument, term       7 years                
Interest expense       $ 200,000 1,900,000 4,000,000            
Net loss on early extinguishment of debt $ 1,400,000                      
Amortization of debt issuance costs       24,000 245,000 517,000            
Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures $ 1,700,000                      
Component of Convertible Debt, Transaction Expense, Early Extinguishment       600,000                
Principal amount       143,750,000.00                
Senior Notes [Member]                        
Debt Instrument [Line Items]                        
Principal amount       395,447,000 319,108,000              
Interest expense       21,700,000 12,600,000              
Amortization of debt issuance costs       100,000                
Principal amount   $ 325,000,000   $ 400,000,000                
Deferred Purchase Price Notes                        
Debt Instrument [Line Items]                        
Debt instrument interest rate (in percent)       0.00%                
Interest expense       $ 600,000 800,000 900,000            
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]                        
Interest expense       $ 1,600,000 4,300,000 6,900,000            
Amortization of debt issuance costs           300,000            
Term Loan [Member]                        
Debt Instrument [Line Items]                        
Line of Credit Facility, Maximum Borrowing Capacity       190,000,000           $ 150,000,000    
Gain (Loss) on Extinguishment of Debt       1,600,000                
Extinguishment of Debt, Transaction Costs       700,000                
Line of Credit Facility, Maximum Borrowing Capacity Additional Borrowing Capacity       75,000,000                
Net loss on early extinguishment of debt       900,000                
Letter of Credit [Member]                        
Debt Instrument [Line Items]                        
Line of Credit Facility, Maximum Borrowing Capacity       15.0                
Repayments of Long-term Lines of Credit   2,000,000                    
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         200,000 $ 200,000            
Revolving Credit Facility, Secured, Floating Rate                        
Debt Instrument [Line Items]                        
Present value of future deferred payments   $ 2,000,000                    
Debt compliance, required maximum leverage ratio       5.66                
Ratio of indebtedness to net capital (in ratio)       0.94                
Ratio of earnings to fixed cost obligations (in ratio)       2.70                
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 $ 27,100,000              
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Credit Agreement [Member]                        
Debt Instrument [Line Items]                        
Debt Instrument, Interest Rate During Period     4.00% 2.90%                
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member]                        
Debt Instrument [Line Items]                        
Debt Issuance Costs, Gross                 $ 900,000   $ 1,100,000  
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member] | Credit Agreement [Member]                        
Debt Instrument [Line Items]                        
Debt instrument interest rate (in percent)       2.125%                
Ratio Actual [Member]                        
Debt Instrument [Line Items]                        
Ratio of indebtedness to net capital (in ratio)       5.00                
Rate Premium Increase       0.50%                
Ratio Actual [Member] | Minimum                        
Debt Instrument [Line Items]                        
Ratio of indebtedness to net capital (in ratio)       0.25                
Ratio Actual [Member] | Maximum                        
Debt Instrument [Line Items]                        
Ratio of indebtedness to net capital (in ratio)       6.00                
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                
Ratio Actual [Member] | Forecast [Member]                        
Debt Instrument [Line Items]                        
Ratio of indebtedness to net capital (in ratio)             5.50 5.75