Acquisitions and Strategic Investments - Narrative (Details) shares in Thousands, $ in Thousands						3 Months Ended				9 Months Ended
	Jul. 06, 2016 USD ($)	Feb. 04, 2016 USD ($)	Jan. 20, 2016 USD ($) shares	Dec. 04, 2015 USD ($)	Jul. 14, 2015 USD ($) installment	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Business Acquisition [Line Items]
Payments to acquire investment			$ 2,000				$ 500
Number of units acquired | shares			2,000				500
Percent owned						18.60%				18.60%
Payments to acquire intangible assets								$ 500		$ 1,594	$ 1,385
Accrued purchase obligation										293	$ 1,300
Goodwill acquired										28,584
DFINE, Inc.
Business Acquisition [Line Items]
Consideration paid	$ 97,500
Consideration paid related to net working capital adjustment	578
Net sales related to acquisition						$ 7,000				7,000
Trade receivables acquired, gross	4,300
Trade receivables, expected to be uncollectible	$ 224
Weighted average useful life	14 years 9 months 21 days
HeRO®Graft
Business Acquisition [Line Items]
Consideration paid		$ 18,500
Weighted average useful life		9 years 9 months 26 days
Income since acquisition date									$ 1,900	5,200
Quellent, LLC
Business Acquisition [Line Items]
Consideration paid					$ 1,000
Payments to acquire intangible assets								500
Number of installments | installment					2
Accrued purchase obligation								500
Noncurrent contingent consideration								270
Goodwill acquired								60
License agreements
Business Acquisition [Line Items]
Intangible assets						17,335		16,671		17,335
Developed technology
Business Acquisition [Line Items]
Intangible assets						139,613		69,861		139,613
Developed technology | DFINE, Inc.
Business Acquisition [Line Items]
Useful life	15 years
Developed technology | HeRO®Graft
Business Acquisition [Line Items]
Useful life		10 years
Developed technology | Quellent, LLC
Business Acquisition [Line Items]
Useful life					13 years
Intangible assets								1,210
Customer Lists
Business Acquisition [Line Items]
Intangible assets						7,142		5,770		7,142
Customer Lists | DFINE, Inc.
Business Acquisition [Line Items]
Useful life	9 years
Customer Lists | HeRO®Graft
Business Acquisition [Line Items]
Useful life		12 years
Trademarks
Business Acquisition [Line Items]
Intangible assets						9,289		4,705		9,289
Trademarks | DFINE, Inc.
Business Acquisition [Line Items]
Useful life	15 years
Trademarks | HeRO®Graft
Business Acquisition [Line Items]
Useful life		5 years 6 months
ArraVasc Limited | License agreements
Business Acquisition [Line Items]
Useful life				12 years
ArraVasc Limited | Additional Payments for License Agreement Milestone | License agreements
Business Acquisition [Line Items]
Payments to acquire intangible assets								$ 1,250
Potential payments on license agreement				$ 250
Cardiovascular Segment | DFINE, Inc.
Business Acquisition [Line Items]
Acquisition-related costs						$ 1,600				$ 1,600