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, 2013		Jun. 30, 2012		Jun. 30, 2013 segment		Jun. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments					2
Total revenues	$ 33,520		$ 33,188		$ 69,056		$ 65,489
Total cost of preservation services and products	12,041		11,817		24,301		22,826
Total gross margin	21,479		21,371		44,755		42,663
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	18,195		16,696		37,991		33,150
Total cost of preservation services and products	3,721		2,673		7,186		5,186
Total gross margin	14,474		14,023		30,805		27,964
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	15,317		16,313		30,994		31,972
Total cost of preservation services and products	8,320		9,144		17,115		17,640
Total gross margin	6,997		7,169		13,879		14,332
Other [Member]
Segment Reporting Information [Line Items]
Total revenues	8	[1]	179	[1]	71	[1]	367	[1]
Total gross margin	$ 8	[1]	$ 179	[1]	$ 71	[1]	$ 367	[1]

[1] For the three and six months ended June 30, 2013 and 2012 the “Other” designation includes grant revenue.