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Investments (Cost-Method Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 29, 2018
Dec. 31, 2017
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Cost method investments $ 21,130   $ 32,710
Ownership percentage (percent) 24.60%    
Cost Method Investee | Respicardia | Prepaid expenses and other current assets      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Outstanding loans $ 500    
Respicardia      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Cost method investments 17,705   17,422
ImThera Medical, Inc.      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Cost method investments 0   12,900
Rainbow Medical Ltd.      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Cost method investments 1,140   1,172
MD Start II      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Cost method investments 1,164   1,199
Highlife S.A.S.      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Cost method investments 1,104   0
Equity method investments     1,800
Ownership percentage (percent)   17.50%  
Other      
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)      
Cost method investments $ 17   $ 17