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Liabilities - Restructuring Accruals (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
employee
Jun. 30, 2018
USD ($)
employee
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Restructuring Accruals          
Number of employees terminated | employee 35 40      
Restructuring charges $ 2,057   $ 5,010 $ 7,669 $ 9,605
Annualized savings 5,000        
Restructuring accruals roll forward          
Balance at the beginning of the period       1,520  
Provision       6,673  
Payments       (5,292)  
Balance at the end of the period 2,901     2,901  
Non-cash charges related to share based compensation       12,720 $ 19,976
Minimum          
Restructuring Accruals          
Additional restructuring costs expected over the next few quarters 1,000     1,000  
Maximum          
Restructuring Accruals          
Additional restructuring costs expected over the next few quarters 2,000     2,000  
Restructuring          
Restructuring accruals roll forward          
Non-cash charges related to share based compensation       1,000  
Personnel severance and related costs          
Restructuring Accruals          
Restructuring charges 1,100 $ 2,400      
Restructuring accruals roll forward          
Balance at the beginning of the period       1,520  
Provision       3,930  
Payments       (2,898)  
Balance at the end of the period 2,552     2,552  
Facility Closing Costs          
Restructuring accruals roll forward          
Provision       2,743  
Payments       (2,394)  
Balance at the end of the period $ 349     $ 349