Acquisitions - Narrative (Details) - USD ($)												3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 01, 2017	Aug. 04, 2017	Jul. 03, 2017	Jul. 01, 2017	Jun. 16, 2017	May 23, 2017	May 19, 2017	May 01, 2017	Jan. 31, 2017	Jul. 06, 2016	Feb. 04, 2016	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2017
Business Acquisition [Line Items]
Payments to acquire intangible assets														$ 1,927,000	$ 1,594,000
Goodwill acquired														19,698,000
Laurane Medical S.A.S.
Business Acquisition [Line Items]
Total purchase price		$ 16,500,000
Contingent consideration		$ 5,500,000
Weighted average useful life		11 years 11 months
Osseon LLC
Business Acquisition [Line Items]
Total purchase price			$ 6,800,000
Net sales related to acquisition												$ 442,000		442,000
Weighted average useful life			8 years 11 months 15 days
Fusion Medical, Inc.
Business Acquisition [Line Items]
Total purchase price						$ 2,500,000
Ownership interest (percent)						19.50%
Equity Method Investments						$ 2,500,000
Fusion Medical, Inc. | Preferred Stock
Business Acquisition [Line Items]
Shares acquired						182,000
Vascular Access Technologies, Inc.
Business Acquisition [Line Items]
Total purchase price								$ 5,000,000
Contingent consideration								$ 4,900,000
Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Total purchase price									$ 10,100,000
Net sales related to acquisition												11,000,000		30,000,000
Weighted average useful life									5 years 11 months 15 days
Reduction of purchase price									$ (797,000)
Argon Medical Devices, Inc. | Preliminary Allocation
Business Acquisition [Line Items]
Total purchase price									10,897,000
Catheter Connections, Inc.
Business Acquisition [Line Items]
Total purchase price									$ 38,000,000
Net sales related to acquisition												2,700,000		7,000,000
Weighted average useful life									11 years 8 months
DFINE, Inc.
Business Acquisition [Line Items]
Total purchase price										$ 97,500,000
Net sales related to acquisition																$ 13,500,000
Weighted average useful life										14 years 10 months
Consideration paid related to net working capital adjustment										$ 578,000
Reduction of purchase price													$ 1,100,000
Measurement period adjustment, reduction in inventories													89,000
Measurement period adjustment, reduction in property and equipment													109,000
Measurement period adjustment, reduction in goodwill													1,200,000
Measurement period adjustment, reduction in accrued expenses													407,000
Measurement period adjustment, increase in deferred tax liabilities													(113,000)
HeRO®Graft
Business Acquisition [Line Items]
Total purchase price											$ 18,500,000
Weighted average useful life											9 years 9 months 25 days
Income since acquisition date														7,100,000
Developed Technology Rights
Business Acquisition [Line Items]
Intangible Assets												172,796,000	$ 135,358,000	172,796,000		135,358,000
Developed Technology Rights | Laurane Medical S.A.S.
Business Acquisition [Line Items]
Useful life		12 years
Developed Technology Rights | Osseon LLC
Business Acquisition [Line Items]
Useful life			9 years
Developed Technology Rights | Vascular Access Technologies, Inc.
Business Acquisition [Line Items]
Useful life								15 years
Developed Technology Rights | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Useful life									7 years
Developed Technology Rights | Catheter Connections, Inc.
Business Acquisition [Line Items]
Useful life									12 years
Developed Technology Rights | DFINE, Inc.
Business Acquisition [Line Items]
Useful life										15 years
Developed Technology Rights | HeRO®Graft
Business Acquisition [Line Items]
Useful life											10 years
Customer lists
Business Acquisition [Line Items]
Intangible Assets												8,481,000		8,481,000	6,860,000
Customer lists | Laurane Medical S.A.S.
Business Acquisition [Line Items]
Useful life		1 year
Customer lists | Osseon LLC
Business Acquisition [Line Items]
Useful life			8 years
Customer lists | Sugan Co, Ltd.
Business Acquisition [Line Items]
Useful life							5 years
Customer lists | Sugan Co, Ltd. | Scenario, Forecast
Business Acquisition [Line Items]
Consideration Payable																	$ 1,100,000
Customer lists | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Useful life									5 years
Customer lists | Catheter Connections, Inc.
Business Acquisition [Line Items]
Useful life									8 years
Customer lists | DFINE, Inc.
Business Acquisition [Line Items]
Useful life										9 years
Customer lists | HeRO®Graft
Business Acquisition [Line Items]
Useful life											12 years
License agreements
Business Acquisition [Line Items]
Payment obligation for certain milestones	$ 15,000,000			$ 5,000,000
Current Royalty Rate	6.00%			6.00%
Useful life				15 years
Payments to acquire intangible assets	$ 11,900,000													2,000,000
Intangible Assets												19,417,000		19,417,000	17,273,000
Patent rights and other intellectual property
Business Acquisition [Line Items]
Payment obligation for certain milestones					$ 750,000
Current Royalty Rate					6.00%
Useful life					15 years
Payments to acquire intangible assets														570,000
Trademarks
Business Acquisition [Line Items]
Intangible Assets												11,878,000		11,878,000	$ 9,050,000
Trademarks | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Useful life									5 years
Trademarks | Catheter Connections, Inc.
Business Acquisition [Line Items]
Useful life									10 years
Trademarks | DFINE, Inc.
Business Acquisition [Line Items]
Useful life										15 years
Trademarks | HeRO®Graft
Business Acquisition [Line Items]
Useful life											5 years 6 months
Cardiovascular Segment | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Acquisition-related costs												90,000		2,500,000
Cardiovascular Segment | Catheter Connections, Inc.
Business Acquisition [Line Items]
Acquisition-related costs												$ 0		$ 482,000
Cardiovascular Segment | DFINE, Inc.
Business Acquisition [Line Items]
Acquisition-related costs																$ 1,600,000