Segment Information (Revenues, Cost Of Services And Products, And Gross Margins For Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014 segment	Jun. 30, 2013
Segment Reporting Information [Line Items]
Number of reportable segments				2
Total revenues	$ 34,690	$ 33,520		$ 70,421	$ 69,056
Total cost of preservation services and products	12,306	12,041		25,564	24,301
Total gross margin	22,384	21,479		44,857	44,755
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	20,350	18,195		39,805	37,991
Total cost of preservation services and products	4,131	3,721		7,932	7,186
Total gross margin	16,219	14,474		31,873	30,805
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	14,340	15,317		30,616	30,994
Total cost of preservation services and products	8,175	8,320		17,632	17,115
Total gross margin	6,165	6,997		12,984	13,879
Other Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		8	[1]		71	[1]
Total gross margin		$ 8	[1]		$ 71	[1]

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