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Restructuring Movement in Restructuring Provisions, Manchester Facility (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
Dec. 31, 2014
Restructuring Reserve [Roll Forward]                
Beginning provision     $ 12,490          
Total provision recognized $ 12,490 $ 7,753 12,490 $ 7,753 $ 7,800     $ 8,800
Utilized     (490)          
Closing provision 12,000   12,000   12,490      
Manchester Facility                
Restructuring Reserve [Roll Forward]                
Beginning provision     200 641 641 $ 2,000 $ 3,167  
Total provision recognized               8,796
Asset write off               (5,629)
Utilized     (92)   (441) (1,359) (1,167)  
Closing provision 108   108   200 641 2,000 3,167
Onerous Lease                
Restructuring Reserve [Roll Forward]                
Beginning provision     2,806          
Utilized     0          
Closing provision 2,806   2,806   2,806      
Onerous Lease | Manchester Facility                
Restructuring Reserve [Roll Forward]                
Beginning provision     200 641 641 2,000 3,167  
Total provision recognized               3,167
Asset write off               0
Utilized     (92)   (441) (1,359) (1,167)  
Closing provision 108   108   200 641 2,000 3,167
Asset Impairment | Manchester Facility                
Restructuring Reserve [Roll Forward]                
Beginning provision     0 $ 0 0 0 0  
Total provision recognized               5,629
Asset write off               (5,629)
Utilized     0   0 0 0  
Closing provision $ 0   $ 0   $ 0 $ 0 $ 0 $ 0