Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands								3 Months Ended	8 Months Ended	11 Months Ended	12 Months Ended
	Oct. 02, 2017	Aug. 04, 2017	Jul. 03, 2017	May 01, 2017	Jan. 31, 2017	Jul. 06, 2016	Feb. 04, 2016	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets Acquired
Goodwill								$ 211,927	$ 238,147	$ 238,147	$ 238,147	$ 211,927	$ 184,472
Liabilities Assumed
Gain on bargain purchase											11,039	$ 0	$ 0
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	3,740
Total assets acquired	13,949
Liabilities Assumed
Trade payables	(216)
Accrued expenses	(542)
Deferred income tax liabilities - current	(1,901)
Total liabilities assumed	(2,659)
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				$ 4,323					4,281	4,281	4,281
Total assets acquired				9,900					9,900	9,900	9,900
Liabilities Assumed
Deferred income tax liabilities - current				(3,073)					(3,101)	(3,101)	(3,101)
Total purchase price				5,000
Adjustments
Goodwill									(42)
Deferred tax liabilities									(28)
Total net assets acquired									0
Vascular Access Technologies, Inc. | Developed technology
Assets Acquired
Intangibles				7,800					7,800	7,800	7,800
Adjustments
Intangibles									0
Vascular Access Technologies, Inc. | In Process Research and Development
Assets Acquired
Intangibles				$ 850					920	920	920
Adjustments
Intangibles									70
Argon Medical Devices, Inc.
Assets Acquired
Cash and cash equivalents					$ 1,436				1,436	1,436	1,436
Trade receivables					8,351				8,351	8,351	8,351
Inventories					12,217				11,222	11,222	11,222
Prepaid expenses and other assets					1,275				1,275	1,275	1,275
Income tax refund receivable					0				165	165	165
Property and equipment					2,667				2,319	2,319	2,319
Deferred tax assets					184				202	202	202
Total assets acquired					31,530				29,570	29,570	29,570
Liabilities Assumed
Trade payables					(2,306)				(2,414)	(2,414)	(2,414)
Accrued expenses					(5,083)				(5,083)	(5,083)	(5,083)
Income taxes payable					2				0	0	0
Deferred income tax liabilities					(999)				(934)	(934)	(934)
Total liabilities assumed					(8,390)				(8,431)	(8,431)	(8,431)
Total net assets acquired					23,140				21,139	21,139	21,139
Gain on bargain purchase					12,243						11,039
Total purchase price					10,897						10,100
Adjustments
Cash and cash equivalents										0
Trade receivables										0
Inventories										(995)
Prepaid expenses and other assets										0
Income tax refund receivable										165
Property and equipment										(348)
Deferred tax assets										18
Total assets acquired										(1,960)
Trade payables										(108)
Accrued expenses										0
Income taxes payable										2
Deferred income tax liabilities										65
Total liabilities assumed										(41)
Total net assets acquired										(2,001)
Gain on bargain purchase										1,204
Total purchase price					(797)					(797)
Business Combination, Bargain Purchase, Gain Recognized, Negative Adjustment, Amount											1,200
Argon Medical Devices, Inc. | Developed technology
Assets Acquired
Intangibles					2,600				2,200	2,200	2,200
Adjustments
Intangibles										(400)
Argon Medical Devices, Inc. | Customer lists
Assets Acquired
Intangibles					1,300				1,500	1,500	1,500
Adjustments
Intangibles										200
Argon Medical Devices, Inc. | Trademarks
Assets Acquired
Intangibles					1,500				900	900	900
Adjustments
Intangibles										(600)
Catheter Connections, Inc.
Assets Acquired
Trade receivables					952				958	958	958
Inventories					2,244				2,157	2,157	2,157
Prepaid expenses and other assets					181				85	85	85
Property and equipment					1,472				1,472	1,472	1,472
Goodwill					7,612				8,989	8,989	8,989
Total assets acquired					38,361				38,361	38,361	38,361
Liabilities Assumed
Trade payables					(338)				(338)	(338)	(338)
Accrued expenses					(23)				(23)	(23)	(23)
Total liabilities assumed					(361)				(361)	(361)	(361)
Total net assets acquired					38,000				38,000	38,000	38,000
Total purchase price					38,000
Adjustments
Trade receivables										6
Inventories										(87)
Prepaid expenses and other assets										(96)
Property and equipment										0
Goodwill										1,377
Total assets acquired										0
Trade payables										0
Accrued expenses										0
Total liabilities assumed										0
Total net assets acquired										0
Catheter Connections, Inc. | Developed technology
Assets Acquired
Intangibles					22,900				21,100	21,100	21,100
Adjustments
Intangibles										(1,800)
Catheter Connections, Inc. | Customer lists
Assets Acquired
Intangibles					100				700	700	700
Adjustments
Intangibles										600
Catheter Connections, Inc. | Trademarks
Assets Acquired
Intangibles					$ 2,900				$ 2,900	2,900	2,900
Adjustments
Intangibles										$ 0
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 - current						(701)
Deferred income tax liabilities						(10,844)
Total liabilities assumed						(18,633)
Total net assets acquired						95,635
Total purchase price						97,500
Cash received											$ 1,327
Adjustments
Inventories								89
Property and equipment								109
Goodwill								1,200
Deferred tax liabilities								113
Total purchase price								$ 1,100
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