Segment Reporting and Foreign Operations - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 258,004	$ 243,975	$ 218,371	$ 243,525	$ 257,922	$ 243,049	$ 255,532	$ 238,349	$ 963,875	$ 994,852	$ 882,753
Operating income (loss)	16,007	64	(18,995)	1,362	(3,409)	(2,881)	12,201	9,523	(1,562)	15,434	58,617
Total other income (expense) - net									(11,669)	(13,241)	(9,098)
Income tax (benefit) expense	(2,133)	825	(3,242)	1,162	(3,757)	(2,292)	2,140	651	(3,388)	(3,258)	7,502
NET INCOME (LOSS)	$ 15,378	$ (3,009)	$ (19,058)	$ (3,154)	$ (4,205)	$ (3,398)	$ 6,859	$ 6,195	(9,843)	5,451	42,017
Cardiovascular
Segment Reporting Information [Line Items]
Net sales									934,202	960,981	849,477
Operating income (loss)									(7,042)	25,780	49,289
Endoscopy
Segment Reporting Information [Line Items]
Net sales									29,673	33,871	33,276
Operating income (loss)									$ 5,480	$ (10,346)	$ 9,328