Segment Reporting and Foreign Operations - Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 778,728	$ 747,165	$ 728,283
Depreciation and amortization	37,425	35,929	32,542
Capital expenditures	50,959	34,181	59,505
Cardiovascular Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	767,952	734,940	716,659
Depreciation and amortization	36,474	34,975	31,594
Capital expenditures	50,927	33,660	59,421
Endoscopy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	10,776	12,225	11,624
Depreciation and amortization	951	954	948
Capital expenditures	$ 32	$ 521	$ 84