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Acquisitions and Divestitures - Pro forma combined financial information (Details) - Vascular Solutions and NeoTract Acquisitions $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Business Acquisition [Line Items]
Net revenue | $	$ 2,255,696
Net income | $	$ 119,934
Earnings per share, basic (in dollars per share) | $ / shares	$ 2.66
Earnings per share, diluted (in dollars per share) | $ / shares	$ 2.57
Weighted average basic shares outstanding, pro forma (in shares) | shares	45,004
Pro forma weighted average shares outstanding, diluted (in shares) | shares	46,664

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