Commitments and Contingencies (Details) (USD $)	6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jul. 31, 2010 Baxter Healthcare Corporation recall	Jun. 30, 2012 Baxter Healthcare Corporation recall item	Jul. 13, 2010 Baxter Healthcare Corporation recall item	Jun. 30, 2012 Baxter Healthcare Corporation recall Minimum	Jun. 30, 2012 Baxter Healthcare Corporation recall Maximum
Commitments and Contingencies
Cash refund for single channel pumps					$ 1,500
Cash refund for triple channel pumps					3,000
Period for providing a replacement pump (in years)			2 years
Applicable infusion pumps owned, number				1,460	11,900
Recalled equipments net gains expected to be recognized						2,000,000	4,000,000
Recalled equipment net gains				15,400,000
Non-cash gain on trade-in of recalled equipment	$ 14,122,000	$ 3,292,000		$ 14,100,000