Revenue Disaggregation of Revenue - Product Line (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 340,378,000	$ 327,169,000	$ 360,460,000	$ 372,033,000	$ 370,124,000	$ 343,236,000	$ 331,514,000	$ 247,739,000	$ 1,400,040,000	$ 1,292,613,000	$ 379,372,000
Percentage of revenue									100.00%	100.00%	100.00%
Infusion Consumables [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 483,039,000	$ 365,665,000	$ 324,868,000
Percentage of revenue									35.00%	28.00%	86.00%
IV Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 507,985,000	$ 521,963,000	$ 0
Percentage of revenue									36.00%	40.00%	0.00%
Infusion Systems [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 355,484,000	$ 290,207,000	$ 0
Percentage of revenue									25.00%	23.00%	0.00%
Critical Care [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 53,532,000	$ 49,961,000	$ 53,601,000
Percentage of revenue									4.00%	4.00%	14.00%
Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 0	$ 64,817,000	$ 903,000
Percentage of revenue									0.00%	5.00%	0.00%