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Acquisitions (Schedule of Allocation of the Purchase Price Consideration of the Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Aug. 21, 2018
Dec. 31, 2017
Feb. 22, 2017
Dec. 31, 2016
Oct. 11, 2016
Business Acquisition [Line Items]            
Goodwill $ 323,671   $ 321,074   $ 304,032  
SolarBOS            
Business Acquisition [Line Items]            
Cash   $ 915        
Working capital   680        
Property, plant, and equipment   483        
Acquired intangible assets   1,450        
Other assets   13        
Other liabilities   (51)        
Goodwill   3,051        
Fair value of purchase consideration   $ 6,541        
Package Concierge            
Business Acquisition [Line Items]            
Cash       $ 590    
Working capital       (1,998)    
Property, plant, and equipment       55    
Acquired intangible assets       3,600    
Other assets       8    
Deferred income taxes       (128)    
Goodwill       16,790    
Fair value of purchase consideration       $ 18,917    
Nexus            
Business Acquisition [Line Items]            
Cash           $ 2,495
Working capital           (1,109)
Property, plant, and equipment           4,702
Acquired intangible assets           6,200
Other assets           23
Goodwill           11,451
Fair value of purchase consideration           $ 23,762