Segment Information (Revenues, Cost Of Services And Products, And Gross Margins For Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments	2
Total revenues	$ 35,731	$ 35,536
Total cost of preservation services and products	13,258	12,260
Total gross margin	22,473	23,276
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	19,455	19,796
Total cost of preservation services and products	3,801	3,465
Total gross margin	15,654	16,331
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	16,276	15,677
Total cost of preservation services and products	9,457	8,795
Total gross margin	6,819	6,882
Other Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		63	[1]
Total gross margin		$ 63	[1]

[1] The “Other” designation includes grant revenue.