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Additional Financial Statement Information Additional Financial Statement Information (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]    
Monthly deposits as percentage of monthly salary   8.33%
Other Liabilities    
Condensed Balance Sheet Statements, Captions [Line Items]    
Severance liability $ 6.6 $ 7.8
Tianjin, People's Republic of China [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Proceeds from lease termination payments   $ (1.5)
Karmiel, Israel Facility    
Condensed Balance Sheet Statements, Captions [Line Items]    
Proceeds from sale of building $ 3.7  
Lease term 5 years  
Gain on sale of building $ 1.7  
Current period gain recognized 0.8  
Deferred revenue $ 0.9