XML 45 R34.htm IDEA: XBRL DOCUMENT v3.19.1
Acquisitions - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 12, 2018
Jun. 28, 2018
Jun. 27, 2018
Mar. 21, 2018
Business Acquisition [Line Items]              
Adjustment for intangibles $ (2,700,000)            
Goodwill 229,319,000   $ 225,322,000        
Measurement period expense 500,000 $ 0          
Acquisition-related expenses 7,723,000 3,102,000          
Adestra              
Business Acquisition [Line Items]              
Adjustment for intangibles 3,300,000            
Goodwill       $ 28,932,000      
Interfax              
Business Acquisition [Line Items]              
Goodwill 83,000,000           $ 13,862,000
Goodwill deductible for tax purposes             $ 2,400,000
RO Innovation              
Business Acquisition [Line Items]              
Goodwill           $ 7,568,000  
Goodwill deductible for tax purposes         $ 2,500,000    
Adestra and Rant & Rave              
Business Acquisition [Line Items]              
Goodwill deductible for tax purposes 0            
Series of Individually Immaterial Business Acquisitions              
Business Acquisition [Line Items]              
Acquisition-related expenses $ 400,000 $ 1,400,000