Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Unreported loss liability	$ 1,800	$ 1,800
Recoverable insurance amounts	719	692
Property and equipment, net	34,408	$ 33,579
PerClot [Member]
Other Commitments [Line Items]
Prepaid royalties	1,500
Net intangible assets	2,500
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