Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 243,975			$ 243,049			$ 705,871	$ 736,930
Operating income (loss)	64			(2,881)			(17,569)	18,844
Total other expense - net	(2,248)			(2,809)			(8,907)	(8,689)
Income tax (benefit) expense	825			(2,292)			(1,255)	499
Net income (loss)	(3,009)	$ (19,058)	$ (3,154)	(3,398)	$ 6,859	$ 6,195	(25,221)	9,656
Cardiovascular
Segment Reporting Information [Line Items]
Net sales	236,413			234,426			684,134	711,570
Operating income (loss)	(1,702)			(6,210)			(20,662)	11,263
Endoscopy
Segment Reporting Information [Line Items]
Net sales	7,562			8,623			21,737	25,360
Operating income (loss)	$ 1,766			$ 3,329			$ 3,093	$ 7,581