Acquisitions - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jan. 31, 2012 Ostial Solutions, LLC [Member]	Nov. 19, 2012 MediGroup [Member]	Dec. 19, 2012 Thomas Medical Products, Inc [Member]	Sep. 02, 2011 Ash [Member]	Dec. 31, 2010 BioSphere [Member]	Jan. 31, 2012 Developed technology [Member] Ostial Solutions, LLC [Member]	Nov. 19, 2012 Developed technology [Member] MediGroup [Member]	Dec. 19, 2012 Developed technology [Member] Thomas Medical Products, Inc [Member]	Sep. 02, 2011 Developed technology [Member] Ash [Member]	Dec. 31, 2010 Developed technology [Member] BioSphere [Member]	Jan. 31, 2012 Customer lists [Member] Ostial Solutions, LLC [Member]	Nov. 19, 2012 Customer lists [Member] MediGroup [Member]	Dec. 19, 2012 Customer lists [Member] Thomas Medical Products, Inc [Member]	Sep. 02, 2011 Customer lists [Member] Ash [Member]	Dec. 31, 2010 Customer lists [Member] BioSphere [Member]	Dec. 31, 2010 License agreements [Member] BioSphere [Member]	Jan. 31, 2012 Trademarks [Member] Ostial Solutions, LLC [Member]	Nov. 19, 2012 Trademarks [Member] MediGroup [Member]	Dec. 19, 2012 Trademarks [Member] Thomas Medical Products, Inc [Member]	Dec. 31, 2010 Trademarks [Member] BioSphere [Member]	Jan. 31, 2012 Non-compete agreements [Member] Ostial Solutions, LLC [Member]	Nov. 19, 2012 Non-compete agreements [Member] MediGroup [Member]	Dec. 19, 2012 Non-compete agreements [Member] Thomas Medical Products, Inc [Member]
Business Acquisition [Line Items]
Marketable securities								$ 9,673
Trade receivables						6,507		4,529
Inventories					263	5,459		5,694
Prepaid expenses						340
Other assets								1,340
Property and equipment					79	2,685	73	546
Deferred income tax assets								16,012
Intangibles									10,500	2,000	43,000	3,200	19,000	600	110	5,000	300	7,900	380	110	80	1,400	3,200	10	210	500
Goodwill	175,108	61,144	58,675	9,580	1,697	102,407	2,697	34,016
Total assets acquired				20,800	4,439	167,298	6,270	102,290
Accounts payable						588		322
Accrued expenses						1,094		3,617
Deferred income tax liabilities								729
Liabilities related to unrecognized tax benefits								961
Other liabilities								936
Total liabilities assumed						1,682		6,565
Net assets acquired, net of cash acquired						165,616		95,725
Cash acquired						$ 1,829		$ 274