Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 238,349	$ 203,035
United States
Disaggregation of Revenue [Line Items]
Net sales	138,060	110,055
International
Disaggregation of Revenue [Line Items]
Net sales	100,289	92,980
Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	230,480	195,855
Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	130,492	103,137
Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	99,988	92,718
Endoscopy
Disaggregation of Revenue [Line Items]
Net sales	7,869	7,180
Stand-alone devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	95,427	83,246
Stand-alone devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	53,400	44,010
Stand-alone devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	42,027	39,236
Cianna Medical | Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	12,849	0
Cianna Medical | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	12,849	0
Cianna Medical | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	0	0
Custom kits and procedure trays | Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	32,943	33,272
Custom kits and procedure trays | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	22,055	22,318
Custom kits and procedure trays | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	10,888	10,954
Inflation devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	22,017	22,419
Inflation devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	7,972	7,668
Inflation devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	14,045	14,751
Catheters | Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	43,039	33,865
Catheters | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	19,412	15,270
Catheters | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	23,627	18,595
Embolization devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	11,827	12,587
Embolization devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	4,706	5,033
Embolization devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	7,121	7,554
CRM/EP | Cardiovascular
Disaggregation of Revenue [Line Items]
Net sales	12,378	10,466
CRM/EP | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net sales	10,098	8,838
CRM/EP | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net sales	2,280	1,628
Endoscopy devices | Endoscopy
Disaggregation of Revenue [Line Items]
Net sales	7,869	7,180
Endoscopy devices | Endoscopy | United States
Disaggregation of Revenue [Line Items]
Net sales	7,568	6,918
Endoscopy devices | Endoscopy | International
Disaggregation of Revenue [Line Items]
Net sales	$ 301	$ 262