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Acquisitions - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed at Date of Acquisition (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Feb. 28, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 210,697   $ 210,080
Business Ink      
Business Acquisition [Line Items]      
Current assets   $ 25,726  
Fixed assets   13,337  
Goodwill   3,314  
Non-current assets   148  
Total assets acquired   81,807  
Current liabilities   (11,586)  
Non-current liabilities   (256)  
Total liabilities assumed   (11,842)  
Net assets acquired   69,965  
Client contracts | Business Ink      
Business Acquisition [Line Items]      
Intangible assets, Acquired   35,150  
Software | Business Ink      
Business Acquisition [Line Items]      
Intangible assets, Acquired   $ 4,132