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Acquisitions Acquisitions (Purchase Price Breakdown) (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 28, 2019
Oct. 09, 2019
Aug. 28, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill       $ 303,887 $ 398,292 $ 287,956
Buffalo, New York [Member]            
Business Acquisition [Line Items]            
Assets Acquired (Excluding Goodwill)   $ 8,147        
Consideration transferred   15,300        
Goodwill   7,135        
Liabilities and Debt Assumed   $ 0        
Dallas, Texas [Member]            
Business Acquisition [Line Items]            
Assets Acquired (Excluding Goodwill) $ 16,148          
Consideration transferred 23,600          
Goodwill 13,956          
Liabilities and Debt Assumed $ 6,479          
Fairfax, Virginia [Member]            
Business Acquisition [Line Items]            
Assets Acquired (Excluding Goodwill)         35,021  
Consideration transferred     $ 102,000      
Goodwill         78,253  
Liabilities and Debt Assumed         $ 11,274  
Longmont, Colorado [Member]            
Business Acquisition [Line Items]            
Payments to acquire businesses       2,800    
Loveland, Colorado [Member]            
Business Acquisition [Line Items]            
Payments to acquire businesses       29,200    
Long Island, New York [Member]            
Business Acquisition [Line Items]            
Payments to acquire businesses       $ 6,000