Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 243,525	$ 238,349
Operating income	1,362	9,523
Total other expense - net	(3,354)	(2,677)
Income tax expense	1,162	651
Net income (loss)	(3,154)	6,195
Cardiovascular
Segment Reporting Information [Line Items]
Net sales	235,544	230,480
Operating income	1,502	7,619
Endoscopy
Segment Reporting Information [Line Items]
Net sales	7,981	7,869
Operating income	$ (140)	$ 1,904