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Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Feb. 22, 2017
Dec. 31, 2016
Oct. 11, 2016
Business Acquisition [Line Items]        
Goodwill $ 321,093   $ 304,032  
Package Concierge        
Business Acquisition [Line Items]        
Cash   $ 590    
Working capital   (2,071)    
Property, plant, and equipment   55    
Acquired intangible assets   3,600    
Other assets   8    
Deferred income taxes   (128)    
Goodwill   16,863    
Fair value of purchase consideration   $ 18,917    
Nexus Corporation        
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