Segment Reporting and Foreign Operations - Assets, Depreciation, Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 1,664,396	$ 1,757,321	$ 1,620,012
Depreciation and amortization	94,070	92,100	69,546
Capital expenditures	45,988	78,173	63,324
Cardiovascular
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,654,866	1,745,057	1,588,970
Depreciation and amortization	93,160	91,151	68,722
Capital expenditures	45,803	77,631	63,032
Endoscopy
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	9,530	12,264	31,042
Depreciation and amortization	910	949	824
Capital expenditures	$ 185	$ 542	$ 292