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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 14, 2018 | Nov. 13, 2018 | May 23, 2018 | Feb. 14, 2018
--- | --- | --- | --- | --- | --- | ---
Assets Acquired |  |  |  |  |  |
Goodwill | $ 334,951 | $ 335,433 |  |  |  |
Vascular Insights |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Inventories |  |  | $ 1,353 |  |  |
Goodwill |  |  | 21,847 |  |  |
Total assets acquired |  |  | 58,200 |  |  |
Vascular Insights | Developed technology |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  | 32,750 |  |  |
Vascular Insights | Customer lists |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  | 840 |  |  |
Vascular Insights | Trademarks |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  | $ 1,410 |  |  |
Cianna Medical |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Trade receivables |  |  |  | $ 6,151 |  |
Inventories |  |  |  | 5,803 |  |
Prepaid expenses and other assets |  |  |  | 315 |  |
Property and equipment |  |  |  | 1,047 |  |
Other long-term assets |  |  |  | 14 |  |
Goodwill |  |  |  | 65,802 |  |
Total assets acquired |  |  |  | 224,052 |  |
Liabilities Assumed |  |  |  |  |  |
Trade payables |  |  |  | (1,497) |  |
Accrued expenses |  |  |  | (2,384) |  |
Other long-term liabilities |  |  |  | (1,527) |  |
Deferred income tax liabilities |  |  |  | (30,363) |  |
Total liabilities assumed |  |  |  | (35,771) |  |
Total net assets acquired |  |  |  | 188,281 |  |
Cianna Medical | Developed technology |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  | 134,510 |  |
Cianna Medical | Customer lists |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  | 3,330 |  |
Cianna Medical | Trademarks |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  | $ 7,080 |  |
DirectACCESS Medical, LLC |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Inventories |  |  |  |  | $ 971 |
Goodwill |  |  |  |  | 938 |
Total assets acquired |  |  |  |  | 7,269 |
DirectACCESS Medical, LLC | Developed technology |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  |  | 4,840 |
DirectACCESS Medical, LLC | Customer lists |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  |  | 120 |
DirectACCESS Medical, LLC | Trademarks |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  |  | $ 400 |
Becton, Dickinson and Company |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Inventories |  |  |  |  |  | $ 5,804
Property and equipment |  |  |  |  |  | 748
Goodwill |  |  |  |  |  | 9,728
Total assets acquired |  |  |  |  |  | 101,880
Becton, Dickinson and Company | Developed technology |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  |  |  | 74,000
Becton, Dickinson and Company | Customer lists |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  |  |  | 4,200
Becton, Dickinson and Company | Trademarks |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  |  |  | 4,900
Becton, Dickinson and Company | In-process technology |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |
Intangibles |  |  |  |  |  | $ 2,500

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