Segment Reporting and Foreign Operations - Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 942,803	$ 778,728	$ 747,165
Depreciation and amortization	43,755	37,425	35,929
Capital expenditures	32,837	50,959	34,181
Cardiovascular Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	932,927	767,952	734,940
Depreciation and amortization	42,806	36,474	34,975
Capital expenditures	32,613	50,927	33,660
Endoscopy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	9,876	10,776	12,225
Depreciation and amortization	949	951	954
Capital expenditures	$ 224	$ 32	$ 521