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Acquisitions - Purchase Price Composition (Details) - USD ($)
$ in Thousands
May 02, 2017
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Deferred compensation - Caisson acquisition   $ 14,137 $ 0
Caisson Interventional LLC      
Business Acquisition [Line Items]      
Cash $ 15,660    
Debt forgiven 6,309    
Deferred consideration 12,994    
Contingent consideration 29,303    
Fair value of consideration transferred 64,266    
Fair value of our interest prior to the acquisition 52,505    
Fair value of total consideration 116,771    
Post-combination compensation expense 5,800    
Other closing costs 2,400    
Cash paid 18,000    
Increases to deferred consideration from post-combination compensation expense 3,400    
Deferred compensation - Caisson acquisition 14,100    
Changes in Fair Value 31,700    
Pre-tax non-cash gain in remeasurement of notes receivable 1,300    
Caisson Interventional LLC | Equity Method Investee      
Business Acquisition [Line Items]      
Non-taxable gain recognized in remeasurement of existing equity investment $ 38,100