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Acquisitions Acquisitions (Purchase Price Breakdown) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 05, 2017
Nov. 07, 2017
Dec. 31, 2017
Dec. 31, 2016
Nov. 08, 2016
Sep. 20, 2016
May 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                
Payments to acquire businesses     $ 23,871          
Present value of future deferred payments     8,884          
Consideration transferred     32,755          
Goodwill     $ 287,956 $ 275,487       $ 264,416
Longmont, Colorado [Member]                
Business Acquisition [Line Items]                
Assets Acquired (Excluding Goodwill)   $ 1,500            
Consideration transferred   2,200            
Goodwill   700            
Liabilities and Debt Assumed   0            
Houston, Texas [Member]                
Business Acquisition [Line Items]                
Assets Acquired (Excluding Goodwill)             $ 7,000  
Goodwill             $ 3,300  
Madera, California [Member]                
Business Acquisition [Line Items]                
Assets Acquired (Excluding Goodwill)           $ 3,700    
Goodwill           $ 1,900    
Brooksfield, Wisconsin [Member]                
Business Acquisition [Line Items]                
Assets Acquired (Excluding Goodwill)         $ 5,700      
Goodwill         $ 1,200      
Loveland, Colorado [Member]                
Business Acquisition [Line Items]                
Assets Acquired (Excluding Goodwill)   1,700            
Consideration transferred   2,300            
Goodwill   700            
Liabilities and Debt Assumed   $ (100)            
Long Island, New York [Member]                
Business Acquisition [Line Items]                
Assets Acquired (Excluding Goodwill) $ 12,500              
Consideration transferred 23,000              
Goodwill 11,100              
Liabilities and Debt Assumed $ (600)