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Business Combination (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Minimum
Jun. 30, 2014
Maximum
Jun. 30, 2014
Convertible Debt
Jun. 03, 2014
Convertible Debt
Jun. 30, 2014
Convertible Debt
Senior Convertible Notes
Jun. 30, 2014
AngioScore
Jun. 30, 2014
AngioScore
Domestic Tax Authority
Jun. 30, 2014
AngioScore
Revenue Milestone
Jun. 30, 2014
AngioScore
European CE Mark Approval for Coronary Arteries
Jun. 30, 2014
AngioScore
European CE Mark Approval for Peripheral Arteries
Jun. 30, 2014
AngioScore
US Investigational Device Exemption
Business Acquisition [Line Items]                                
Cash payments to acquire business                     $ 230,000,000          
Sales ratio multiple                     2.0          
Sales ratio multiple, threshold                     10.00%          
Contingent consideration arrangements, high end of potential range                         50,000,000 5,000,000 5,000,000 15,000,000
Convertible senior notes 230,000,000   230,000,000   0       230,000,000 230,000,000            
Due diligence, transaction, and integration costs 3,958,000 0 4,229,000 0                        
Fair value of contingent consideration                     25,886,000          
Discount Rate           9.00% 19.00%                  
Stated interest rate               2.625% 2.625%              
Operating Loss Carryforwards                       $ 87,000,000