Segment Reporting and Foreign Operations - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net Sales	$ 233,249	$ 221,659	$ 224,810	$ 203,035	$ 190,897	$ 179,337	$ 186,549	$ 171,069	$ 882,753	$ 727,852	$ 603,838
United States
Disaggregation of Revenue [Line Items]
Net Sales									496,413	420,703	370,350
International
Disaggregation of Revenue [Line Items]
Net Sales									386,340	307,149	233,488
Cardiovascular
Disaggregation of Revenue [Line Items]
Net Sales									849,477	700,613	580,151
Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net Sales									464,224	394,346	347,400
Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net Sales									385,253	306,267	232,751
Endoscopy
Disaggregation of Revenue [Line Items]
Net Sales									33,276	27,239	23,687
Stand-alone devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Net Sales									361,613	275,456	191,127
Stand-alone devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net Sales									202,129	148,620	105,250
Stand-alone devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net Sales									159,484	126,836	85,877
Custom kits and procedure trays | Cardiovascular
Disaggregation of Revenue [Line Items]
Net Sales									134,756	126,089	119,247
Custom kits and procedure trays | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net Sales									92,975	92,474	93,109
Custom kits and procedure trays | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net Sales									41,781	33,615	26,138
Inflation devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Net Sales									92,419	79,875	73,916
Inflation devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net Sales									31,717	31,848	35,506
Inflation devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net Sales									60,702	48,027	38,410
Catheters | Cardiovascular
Disaggregation of Revenue [Line Items]
Net Sales									155,525	127,747	113,367
Catheters | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net Sales									68,708	62,284	56,899
Catheters | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net Sales									86,817	65,463	56,468
Embolization devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Net Sales									50,038	49,532	46,035
Embolization devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net Sales									20,433	22,374	24,075
Embolization devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net Sales									29,605	27,158	21,960
CRM/EP | Cardiovascular
Disaggregation of Revenue [Line Items]
Net Sales									48,834	41,914	36,459
CRM/EP | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Net Sales									41,970	36,746	32,561
CRM/EP | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Net Sales									6,864	5,168	3,898
Endoscopy devices | Endoscopy
Disaggregation of Revenue [Line Items]
Net Sales									33,276	27,239	23,687
Endoscopy devices | Endoscopy | United States
Disaggregation of Revenue [Line Items]
Net Sales									32,189	26,357	22,950
Endoscopy devices | Endoscopy | International
Disaggregation of Revenue [Line Items]
Net Sales									$ 1,087	$ 882	$ 737