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Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 327,169	$ 343,236	$ 1,059,662	$ 922,489
Cumulative Effect on Retained Earnings, Net of Tax			6,300
Infusion Systems [Member]
Disaggregation of Revenue [Line Items]
Revenues	81,456	$ 82,798	263,271	$ 202,590
Infusion Systems [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	4,200		10,200
Equipment revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount	6,400		6,400
Software revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,500		$ 1,500