Hemosphere Acquisition (Narrative) (Details) (USD $)	12 Months Ended				0 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 16, 2012	May 16, 2012 Hemosphere [Member]	Dec. 31, 2012 Hemosphere [Member]	Dec. 31, 2012 Hemosphere [Member]
Percentage of outstanding equity acquired					100.00%
Cash paid for acquisition					$ 17,000,000
Cash acquired from acquisition					3,200,000
Fair value of contingent consideration					1,800,000
Total purchase price						22,035,000	22,035,000
Maximum amount of future consideration payment					4,500,000
Cost of debt based discount rate				8.00%
Loss on revaluation of contingent consideration	72,000
Fair value of contingent consideration	1,900,000
Business acquisition, transaction and integration costs							2,400,000
Revenues	$ 131,718,000	$ 119,626,000	$ 116,645,000			$ 3,100,000
Income tax rate	34.00%	36.00%	46.00%				34.00%