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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Other Commitments [Line Items]    
Unreported loss liability $ 1,600 $ 1,500
Recoverable insurance amounts 716 626
Property and equipment, net 20,607 $ 18,502
PerClot [Member]    
Other Commitments [Line Items]    
Prepaid royalties 1,500  
Net intangible assets 2,700  
Property and equipment, net 1,400  
Maximum [Member]    
Other Commitments [Line Items]    
Estimated loss $ 3,000  
Starch Technology Purchase [Member]    
Other Commitments [Line Items]    
Term of distribution agreement 15 years  
Expected future contingent payment amounts $ 1,000  
Number of notice days 180 days