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Acquisitions - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Oct. 04, 2013 Radial Assist | Oct. 04, 2013 Datascope | Jan. 31, 2012 Ostial Solutions, LLC | Nov. 19, 2012 MediGroup | Dec. 19, 2012 Thomas Medical Products, Inc | Sep. 02, 2011 Ash | Oct. 04, 2013 Developed technology Radial Assist | Oct. 04, 2013 Developed technology Datascope | Jan. 31, 2012 Developed technology Ostial Solutions, LLC | Nov. 19, 2012 Developed technology MediGroup | Dec. 19, 2012 Developed technology Thomas Medical Products, Inc | Sep. 02, 2011 Developed technology Ash | Oct. 04, 2013 Customer lists Radial Assist | Oct. 04, 2013 Customer lists Datascope | Jan. 31, 2012 Customer lists Ostial Solutions, LLC | Nov. 19, 2012 Customer lists MediGroup | Dec. 19, 2012 Customer lists Thomas Medical Products, Inc | Sep. 02, 2011 Customer lists Ash | Oct. 04, 2013 Trademarks Radial Assist | Oct. 04, 2013 Trademarks Datascope | Jan. 31, 2012 Trademarks Ostial Solutions, LLC | Nov. 19, 2012 Trademarks MediGroup | Dec. 19, 2012 Trademarks Thomas Medical Products, Inc | Jan. 31, 2012 Non-compete agreements Ostial Solutions, LLC | Nov. 19, 2012 Non-compete agreements MediGroup | Dec. 19, 2012 Non-compete agreements Thomas Medical Products, Inc
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  |  |  |  | $ 6,507 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  | 16 | 478 |  | 263 | 5,459 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses |  |  |  |  |  |  |  | 340 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  | 79 | 2,685 | 73 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  | 1,520 | 18,200 | 10,500 | 2,000 | 43,000 | 3,200 | 20 | 390 | 600 | 110 | 5,000 | 300 | 40 | 320 | 110 | 80 | 1,400 | 10 | 210 | 500
Goodwill | 184,505 | 175,108 | 61,144 | 904 | 8,112 | 9,580 | 1,697 | 102,407 | 2,697 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  | 2,500 | 27,500 | 20,800 | 4,439 | 167,298 | 6,270 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  |  |  | 588 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  |  |  | 1,094 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  |  |  | 1,682 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired, net of cash acquired |  |  |  |  |  |  |  | 165,616 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  |  |  |  |  |  |  | $ 1,829 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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