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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 |

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