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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]
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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