Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands										12 Months Ended
	May 23, 2018	Feb. 14, 2018	Oct. 02, 2017	Aug. 04, 2017	Jul. 03, 2017	May 01, 2017	Jan. 31, 2017	Jul. 06, 2016	Feb. 04, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 14, 2018	Nov. 13, 2018	Jan. 31, 2018
Assets Acquired
Goodwill										$ 335,433	$ 238,147	$ 211,927
Liabilities Assumed
Gain on bargain purchase										$ 0	$ (11,039)	$ 0
Vascular Insights
Assets Acquired
Inventories													$ 1,308
Goodwill													21,832
Total assets acquired													58,220
Vascular Insights | Developed technology
Assets Acquired
Intangibles													32,830
Vascular Insights | Customer lists
Assets Acquired
Intangibles													840
Vascular Insights | Trademarks
Assets Acquired
Intangibles													$ 1,410
Cianna Medical, Inc.
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														65,885
Total assets acquired														224,135
Liabilities Assumed
Trade payables														(1,497)
Accrued expenses														(2,384)
Deferred income tax liabilities														(30,363)
Other long-term liabilities														(1,527)
Total liabilities assumed														(35,771)
Total net assets acquired														188,364
Cianna Medical, Inc. | Developed technology
Assets Acquired
Intangibles														134,510
Cianna Medical, Inc. | Customer lists
Assets Acquired
Intangibles														3,330
Cianna Medical, Inc. | Trademarks
Assets Acquired
Intangibles														$ 7,080
DirectACCESS Medical, LLC
Assets Acquired
Inventories	$ 971
Goodwill	938
Total assets acquired	7,269
Liabilities Assumed
Total purchase price	7,300
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
Liabilities Assumed
Total purchase price		100,300
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 Research and Development
Assets Acquired
Intangibles		$ 2,500
ITL Healthcare Pty Ltd
Assets Acquired
Trade receivables			$ 1,287
Other receivables			56
Inventories			1,808
Prepaid expenses and other assets			65
Property and equipment			1,053
Goodwill			3,945
Total assets acquired			14,154
Liabilities Assumed
Trade payables			(216)
Accrued expenses			(747)
Deferred income tax liabilities			(1,901)
Total liabilities assumed			(2,864)
Total net assets acquired			11,290
Total purchase price			11,300
ITL Healthcare Pty Ltd | Customer lists
Assets Acquired
Intangibles			$ 5,940
Laurane Medical S.A.S.
Assets Acquired
Inventories				$ 594
Goodwill				6,366
Total assets acquired				22,000
Liabilities Assumed
Total purchase price				16,500
Laurane Medical S.A.S. | Developed technology
Assets Acquired
Intangibles				14,920
Laurane Medical S.A.S. | Customer lists
Assets Acquired
Intangibles				$ 120
Osseon LLC
Assets Acquired
Inventories					$ 979
Property and equipment					58
Goodwill					203
Total assets acquired					6,840
Liabilities Assumed
Total purchase price					6,800
Osseon LLC | Developed technology
Assets Acquired
Intangibles					5,400
Osseon LLC | Customer lists
Assets Acquired
Intangibles					$ 200
Vascular Access Technologies, Inc.
Assets Acquired
Goodwill						$ 4,281
Total assets acquired						9,900
Liabilities Assumed
Deferred income tax liabilities						(3,101)
Total purchase price						5,000
Vascular Access Technologies, Inc. | Developed technology
Assets Acquired
Intangibles						7,800
Vascular Access Technologies, Inc. | In Process Research and Development
Assets Acquired
Intangibles						$ 920
Argon Medical Devices, Inc.
Assets Acquired
Cash and cash equivalents							$ 1,436
Trade receivables							8,351
Inventories							11,222
Prepaid expenses and other assets							1,275
Income tax refund receivable							165
Property and equipment							2,319
Deferred tax assets							202
Total assets acquired							29,570
Liabilities Assumed
Trade payables							(2,414)
Accrued expenses							(5,083)
Income taxes payable							0
Deferred income tax liabilities							(934)
Total liabilities assumed							(8,431)
Total net assets acquired							21,139
Gain on bargain purchase							(11,039)
Total purchase price							10,100
Argon Medical Devices, Inc. | Developed technology
Assets Acquired
Intangibles							2,200
Argon Medical Devices, Inc. | Customer lists
Assets Acquired
Intangibles							1,500
Argon Medical Devices, Inc. | Trademarks
Assets Acquired
Intangibles							900
Catheter Connections, Inc.
Assets Acquired
Trade receivables															$ 958
Inventories															2,157
Prepaid expenses and other assets															85
Property and equipment															1,472
Goodwill															8,989
Total assets acquired															38,361
Liabilities Assumed
Trade payables															(338)
Accrued expenses															(23)
Total liabilities assumed															(361)
Total net assets acquired															38,000
Total purchase price							$ 38,000
Catheter Connections, Inc. | Developed technology
Assets Acquired
Intangibles															21,100
Catheter Connections, Inc. | Customer lists
Assets Acquired
Intangibles															700
Catheter Connections, Inc. | Trademarks
Assets Acquired
Intangibles															$ 2,900
DFINE, Inc.
Assets Acquired
Trade receivables								$ 4,054
Other receivables								6
Inventories								8,585
Prepaid expenses and other assets								630
Property and equipment								1,630
Other long-term assets								145
Goodwill								24,818
Total assets acquired								114,268
Liabilities Assumed
Trade payables								(1,790)
Accrued expenses								(5,298)
Deferred income tax liabilities								(701)
Deferred income tax liabilities - noncurrent								(10,844)
Total liabilities assumed								(18,633)
Total net assets acquired								95,635
Total purchase price								97,500
Cash received								1,327
DFINE, Inc. | Developed technology
Assets Acquired
Intangibles								67,600
DFINE, Inc. | Customer lists
Assets Acquired
Intangibles								2,400
DFINE, Inc. | Trademarks
Assets Acquired
Intangibles								$ 4,400
HeRO®Graft
Assets Acquired
Inventories									$ 2,455
Property and equipment									290
Goodwill									2,555
Total assets acquired									18,500
Liabilities Assumed
Total purchase price									18,500
HeRO®Graft | Developed technology
Assets Acquired
Intangibles									12,100
HeRO®Graft | Customer lists
Assets Acquired
Intangibles									400
HeRO®Graft | Trademarks
Assets Acquired
Intangibles									$ 700