Revenue Disaggregation of Revenue - Product Line (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
Disaggregation of Revenue [Line Items]
Revenues	$ 320,451	$ 318,567	$ 303,379	$ 328,607	$ 315,523	$ 307,471	$ 312,282	$ 330,932	$ 1,271,004	$ 1,266,208	$ 1,400,040
Percentage of revenue									100.00%	100.00%	100.00%
Infusion Consumables [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 473,740	$ 477,611	$ 483,039
Percentage of revenue									37.00%	37.00%	35.00%
Infusion Systems [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 359,691	$ 328,282	$ 355,484
Percentage of revenue									28.00%	26.00%	25.00%
IV Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 388,971	$ 414,971	$ 507,985
Percentage of revenue									31.00%	33.00%	36.00%
Critical Care [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 48,602	$ 45,344	$ 53,532
Percentage of revenue									4.00%	4.00%	4.00%