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Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 15, 2018
Apr. 02, 2018
Sep. 29, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill       $ 475,206 $ 395,504 $ 386,772
MXD Group            
Business Acquisition [Line Items]            
Purchase price of outstanding equity in acquisition   $ 118,000        
Customer relationships and other intangibles   23,651        
Goodwill   $ 63,424        
Metro            
Business Acquisition [Line Items]            
Purchase price of outstanding equity in acquisition $ 52,000          
Customer relationships and other intangibles 400          
Tangible assets net of liabilities assumed 19,000          
Goodwill $ 32,000          
Dallas Service Center, Inc. [Member]            
Business Acquisition [Line Items]            
Purchase price of outstanding equity in acquisition     $ 8,000      
Customer Relationships | MXD Group            
Business Acquisition [Line Items]            
Amortization period       8 years