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Related Party Transactions (Narrative) (Details)
$ in Thousands
12 Months Ended
Jan. 16, 2018
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
May 30, 2018
member
Related Party Transaction [Line Items]          
Common stock, shares outstanding (in shares) | shares   72,938,546 70,065,130    
Number of fixed members on the Company's Board of Directors | member         8
Investor          
Related Party Transaction [Line Items]          
Revenues   $ 13,314 $ 17,464 $ 12,662  
Interest expense   $ 24,480 23,494 16,023  
Investor | WPP          
Related Party Transaction [Line Items]          
Common stock, shares outstanding (in shares) | shares   11,319,363      
Ownership percentage common stock outstanding shares   15.50%      
Revenues   $ 13,315 15,858 11,610  
Interest expense   0 0 (343)  
Investor | Starboard Value LP          
Related Party Transaction [Line Items]          
Interest expense   $ 33,300 30,800 16,400  
Affiliated entity | Lightspeed          
Related Party Transaction [Line Items]          
Agreement term (in years)   5 years      
Annual purchase obligation   $ 5,400      
Beneficial owner | Starboard Value LP          
Related Party Transaction [Line Items]          
Ownership percentage common stock outstanding shares 5.00%        
Subscription Receivable | Affiliated entity          
Related Party Transaction [Line Items]          
Revenues   $ 6,600 $ 8,300 $ 2,800