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Liabilities - Restructuring Accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring accruals Roll forward    
Balance at the beginning of the period $ 1,520  
Provision 2,523  
Payments (2,653)  
Balance at the end of the period 1,390  
Non-cash charges related to share based compensation 4,537 $ 4,186
Restructuring    
Restructuring accruals Roll forward    
Non-cash charges related to share based compensation 200  
Personnel Severance and Related Costs    
Restructuring accruals Roll forward    
Balance at the beginning of the period 1,520  
Provision 655  
Payments (785)  
Balance at the end of the period 1,390  
Facility Related Costs    
Restructuring accruals Roll forward    
Provision 1,868  
Payments $ (1,868)