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Long-Term Debt Long-Term Debt (Narrative) (Details)
 6 Months Ended 12 Months Ended
Dec. 24, 2018
USD ($)
Nov. 08, 2018
USD ($)
Nov. 07, 2018
USD ($)
May 31, 2018
USD ($)
May 07, 2018
USD ($)
Nov. 30, 2016
USD ($)
Jun. 30, 2018
Dec. 31, 2018
USD ($)
letter_of_credit
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 19, 2014
Debt Instrument [Line Items]                      
Present value of future deferred payments           $ 2,000,000          
Line Of Credit Facility Accordion Provision               $ 75,000,000      
Principal amount               $ 36,040,000      
Letters of Credit | letter_of_credit               1      
Repayments of Long-term Lines of Credit               $ 189,400,000 $ 82,600,000 $ 96,100,000  
Write off of Deferred Debt Issuance Cost       $ 700,000       502,000 0 567,000  
Gain (Loss) on Extinguishment of Debt               900,000      
Amortization of debt issuance costs               $ 532,000 820,000 824,000  
Percentage of Assets               50.00%      
Convertible subordinated notes                      
Debt Instrument [Line Items]                      
Principal amount               $ 6,346,000 143,750,000    
Debt instrument interest rate (in percent)               2.75%     2.75%
Debt instrument, term               7 years      
Interest expense               $ 1,900,000 4,000,000 4,000,000  
Write off of Deferred Debt Issuance Cost $ 1,400,000             700,000      
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 78.00%       80.00%            
Amortization of debt issuance costs               200,000 500,000 500,000  
Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures $ 1,700,000       $ 1,200,000            
Component of Convertible Debt, Transaction Expense, Early Extinguishment         $ 500,000     600,000      
Principal amount               143,750,000.00      
Senior Notes [Member]                      
Debt Instrument [Line Items]                      
Principal amount               $ 319,108,000 $ 0    
Debt Instrument, Interest Rate During Period               6.87% 6.69%    
Debt instrument interest rate (in percent)               6.625%      
Repayments of Long-term Lines of Credit       291,400,000              
Debt instrument, term               89 months      
Interest expense               $ 12,600,000      
Amortization of debt issuance costs               100,000      
Debt Issuance Costs, Gross       1,400,000              
Principal amount       325,000,000       $ 325,000,000      
Deferred Purchase Price Notes                      
Debt Instrument [Line Items]                      
Debt instrument interest rate (in percent)               0.00%      
Interest expense               $ 800,000 $ 900,000 500,000  
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]                      
Amortization of debt issuance costs               $ 100,000 300,000 400,000  
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity               200,000,000      
Write off of Deferred Debt Issuance Cost       900,000       1,600,000      
Revolving Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Principal amount               0 $ 92,000,000    
Term Loan [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity               150,000,000      
Loans Payable [Member]                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity               $ 148,019,435      
Amortization of debt issuance costs                   $ 100,000  
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               5.5      
Ratio of indebtedness to net capital (in ratio)               5.10      
Debt compliance, required minimum fixed charge ratio               1.20      
Ratio of earnings to fixed cost obligations (in ratio)               1.84      
Revolving Credit Facility, Secured, Floating Rate | Line of Credit | Prime Rate Option                      
Debt Instrument [Line Items]                      
Debt instrument interest rate (in percent)               0.875%      
Revolving Credit Facility, Secured, Floating Rate | Line of Credit | LIBOR Margin Option                      
Debt Instrument [Line Items]                      
Debt instrument interest rate (in percent)               1.875%      
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Principal amount               $ 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% 0.40%      
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Debt Compliance, EBITDA   $ 2,000,000 $ 1,000,000                
Debt Instrument, Debt Compliance, Aggregate Amount   30,000,000                  
Debt Issuance Costs, Gross   $ 1,100,000                  
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member] | Minimum                      
Debt Instrument [Line Items]                      
Debt compliance, required maximum leverage ratio   4.50                  
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member] | Maximum                      
Debt Instrument [Line Items]                      
Debt compliance, required maximum leverage ratio   5.25                  
Revolving Credit Facility, Secured, Floating Rate | Loans Payable [Member] | Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Debt instrument interest rate (in percent)               2.125%