Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 218,371		$ 255,532		$ 461,896	$ 493,881
Operating income (loss)	(18,995)		12,201		(17,633)	21,724
Total other expense - net	(3,305)		(3,202)		(6,659)	(5,879)
Income tax (benefit) expense	(3,242)		2,140		(2,080)	2,791
Net income (loss)	(19,058)	$ (3,154)	6,859	$ 6,195	(22,212)	13,054
Cardiovascular
Segment Reporting Information [Line Items]
Net sales	212,177		246,666		447,721	477,146
Operating income (loss)	(20,462)		9,855		(18,960)	17,474
Endoscopy
Segment Reporting Information [Line Items]
Net sales	6,194		8,866		14,175	16,735
Operating income (loss)	$ 1,467		$ 2,346		$ 1,327	$ 4,250