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Acquisitions - Contingent Consideration Reconciliation (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
company
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Number of businesses acquired | company 3
Level 3 | Caisson Interventional LLC  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair value, liability beginning balance $ 3,890
Purchase price - Caisson contingent consideration 31,688
Payments (1,841)
Changes in fair value 231
Effect of changes in foreign currency exchange rates 249
Fair value, liability ending balance $ 34,217