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Acquisitions (Narrative) (Details)
$ in Millions
Aug. 28, 2018
USD ($)
Aug. 21, 2018
USD ($)
Jul. 10, 2018
USD ($)
acquisitions
Business Acquisition [Line Items]      
Number of businesses acquired     2
Payments to acquire businesses | $ $ 6.0 $ 2.8 $ 29.2
Fredericksburg, Virginia      
Business Acquisition [Line Items]      
Number of businesses acquired     1
Stafford, Virginia      
Business Acquisition [Line Items]      
Number of businesses acquired     1