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Acquisitions (Net Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2012 Ostial Solutions, LLC [Member] | Nov. 19, 2012 MediGroup [Member] | Dec. 19, 2012 Thomas Medical Products, Inc [Member] | Jan. 31, 2012 Developed Technology Rights [Member] Ostial Solutions, LLC [Member] | Nov. 19, 2012 Developed Technology Rights [Member] MediGroup [Member] | Dec. 19, 2012 Developed Technology Rights [Member] Thomas Medical Products, Inc [Member] | Jan. 31, 2012 Noncompete Agreements [Member] Ostial Solutions, LLC [Member] | Nov. 19, 2012 Noncompete Agreements [Member] MediGroup [Member] | Dec. 19, 2012 Noncompete Agreements [Member] Thomas Medical Products, Inc [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] | 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]
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | $ 6,507 |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  | 263 | 5,459 |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses |  |  |  |  | 340 |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  | 79 | 2,685 |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 10,500 | 2,000 | 43,000 | 10 | 210 | 500 | 600 | 110 | 5,000 | 110 | 80 | 1,400
Goodwill | 175,108 | 175,108 | 9,580 | 1,697 | 102,407 |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  | 20,800 | 4,439 | 167,298 |  |  |  |  |  |  |  |  |  |  |  |
Trade payables |  |  |  |  | 588 |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  | 1,094 |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  | 1,682 |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired, net of cash acquired |  |  |  |  | 165,616 |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired, cash acquired |  |  |  |  | $ 1,829 |  |  |  |  |  |  |  |  |  |  |  |

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