Segment Reporting and Foreign Operations - Assets, Depreciation, Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 1,757,321	$ 1,620,012	$ 1,111,811
Depreciation and amortization	92,100	69,546	53,582
Capital expenditures	78,173	63,324	38,623
Cardiovascular
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,745,057	1,588,970	1,103,806
Depreciation and amortization	91,151	68,722	52,700
Capital expenditures	77,631	63,032	38,437
Endoscopy
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	12,264	31,042	8,005
Depreciation and amortization	949	824	882
Capital expenditures	$ 542	$ 292	$ 186