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Liabilities - Restructuring Accruals (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
employee
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Restructuring accruals        
Number of employees terminated | employee 40      
Restructuring charges $ 2,917 $ 3,257 $ 5,612 $ 4,595
Restructuring accruals Roll forward        
Balance at the beginning of the period     1,520  
Provision     4,783  
Payments     (4,125)  
Balance at the end of the period 2,178   2,178  
Non-cash charges related to share based compensation     9,441 $ 13,806
Minimum        
Restructuring accruals        
Additional restructuring costs expected over the next few quarters 2,000   2,000  
Maximum        
Restructuring accruals        
Additional restructuring costs expected over the next few quarters 4,000   4,000  
Restructuring        
Restructuring accruals Roll forward        
Non-cash charges related to share based compensation     800  
Personnel Severance and Related Costs        
Restructuring accruals        
Restructuring charges 1,700      
Restructuring accruals Roll forward        
Balance at the beginning of the period     1,520  
Provision     2,412  
Payments     (1,754)  
Balance at the end of the period $ 2,178   2,178  
Facility Related Costs        
Restructuring accruals Roll forward        
Provision     2,371  
Payments     $ (2,371)