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Restructuring - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 31, 2018
Jun. 21, 2017
Restructuring Cost and Reserve [Line Items]                  
Expected number of positions eliminated (as a percent) 50.00%   50.00%           50.00%
Restructuring $ 2,892 $ 1,992 $ 3,584 $ 3,480 $ 4,030 $ 5,400 $ 0    
Payments for restructuring     1,311   6,551        
Restructuring reserve 500   500   400        
Restructuring cost incurred to date 12,800   12,800   9,400        
One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring   1,300   2,300 2,700        
Special Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring   300   300 300        
Fixed Asset Impairment                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring   300   300 400        
Legal Fees                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring   $ 100     600        
May 2018 Restructuring Activities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring cost incurred to date 2,900   2,900            
May 2018 Restructuring Activities | One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring 700                
May 2018 Restructuring Activities | Fixed Asset Impairment                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring 2,200   2,200            
January 2018 and May 2018 Restructuring Activities | One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring     1,400            
Payments for restructuring     1,300            
December 2016 Restructuring Activities                  
Restructuring Cost and Reserve [Line Items]                  
Expected number of positions eliminated (as a percent)           30.00%      
Restructuring         6,900        
Payments for restructuring         4,700        
Restructuring cost incurred to date 6,900   6,900   6,900        
December 2016 Restructuring Activities | One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         2,400        
Payments for restructuring       $ 4,100          
Restructuring cost incurred to date         2,400        
December 2016 Restructuring Activities | Special Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         1,700        
Restructuring cost incurred to date         1,700        
December 2016 Restructuring Activities | Fixed Asset Impairment                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         2,000        
Restructuring cost incurred to date         2,000        
December 2016 Restructuring Activities | Legal Fees                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         900        
Restructuring cost incurred to date         900        
June 2017 Restructuring Activities                  
Restructuring Cost and Reserve [Line Items]                  
Expected number of positions eliminated (as a percent)                 50.00%
Restructuring         2,300        
Payments for restructuring         1,900        
Restructuring cost incurred to date 2,300   2,300   2,300        
June 2017 Restructuring Activities | One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         1,700        
June 2017 Restructuring Activities | Special Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         300        
June 2017 Restructuring Activities | Fixed Asset Impairment                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         200        
June 2017 Restructuring Activities | Legal Fees                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring         $ 100        
January 2018 Restructuring Activities                  
Restructuring Cost and Reserve [Line Items]                  
Expected number of positions eliminated (as a percent)               50.00%  
Restructuring cost incurred to date $ 700   $ 700