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, 2013 segment		Mar. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments	2
Total revenues	$ 35,536		$ 32,301
Total cost of preservation services and products	12,260		11,009
Total gross margin	23,276		21,292
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	19,796		16,454
Total cost of preservation services and products	3,465		2,513
Total gross margin	16,331		13,941
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	15,677		15,659
Total cost of preservation services and products	8,795		8,496
Total gross margin	6,882		7,163
Other [Member]
Segment Reporting Information [Line Items]
Total revenues	63	[1]	188	[1]
Total gross margin	$ 63	[1]	$ 188	[1]

[1] For the three months ended March 31, 2013 and 2012 the “Other” designation includes grant revenue.