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Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Aug. 21, 2018
Dec. 31, 2017
Feb. 22, 2017
Business Acquisition [Line Items]        
Goodwill $ 323,321   $ 321,074  
SolarBOS        
Business Acquisition [Line Items]        
Cash   $ 915    
Working capital   828    
Property, plant, and equipment   547    
Acquired intangible assets   1,450    
Other assets   13    
Other liabilities   (51)    
Goodwill   2,838    
Fair value of purchase consideration   $ 6,540    
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