Segment Reporting and Foreign Operations - Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 728,283	$ 705,309	$ 447,017
Depreciation and amortization	32,542	22,534	19,194
Capital expenditures	59,505	64,643	59,195
Cardiovascular Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	716,659	692,689	434,747
Depreciation and amortization	31,594	21,441	18,219
Capital expenditures	59,421	64,059	58,775
Endoscopy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	11,624	12,620	12,270
Depreciation and amortization	948	1,093	975
Capital expenditures	$ 84	$ 584	$ 420