Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 372,033,000	$ 247,739,000
Cumulative Effect on Retained Earnings, Net of Tax	6,300,000
Infusion Systems [Member]
Disaggregation of Revenue [Line Items]
Revenues	93,439,000	$ 46,670,000
Infusion Systems [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,300,000
Equipment revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation	7,600,000
Software revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation	$ 4,200,000