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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
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 |

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