Segment And Geographic Information (Revenues, Cost Of Services And Products, And Gross Margins For Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013 segment		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments													2
Total revenues	$ 35,457	$ 36,250	$ 33,520	$ 35,536	$ 32,800	$ 33,429	$ 33,188	$ 32,301	$ 30,397	$ 29,654	$ 29,379	$ 30,196	$ 140,763		$ 131,718		$ 119,626
Total cost of preservation services and products													50,377		46,700		43,782
Total gross margin	22,282	23,349	21,479	23,276	21,045	21,310	21,371	21,292	19,375	18,912	19,053	18,504	90,386		85,018		75,844
Percent of long-lived assets held in U.S.	95.00%				95.00%								95.00%		95.00%
Goodwill allocated entirely to Medical Devices segment	11,365				11,365								11,365		11,365
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues													76,194		67,496		59,387
Total cost of preservation services and products													15,147		11,380		9,442
Total gross margin													61,047		56,116		49,945
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues													64,498		63,603		59,793
Total cost of preservation services and products													35,230		35,320		34,340
Total gross margin													29,268		28,283		25,453
Other [Member]
Segment Reporting Information [Line Items]
Total revenues													71	[1]	619	[1]	446	[1]
Total gross margin													$ 71	[1]	$ 619	[1]	$ 446	[1]

[1] For the years ended December 31, 2013, 2012, and 2011 the “Other” designation includes grant revenue.