Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Goodwill [Roll Forward]
Balance as of December 31, 2013	$ 14,846
Additional goodwill related to AngioScore acquisition (Note 2)	133,649
Balance as of June 30, 2014	148,495
U.S. Medical
Goodwill [Roll Forward]
Balance as of December 31, 2013	8,165
Additional goodwill related to AngioScore acquisition (Note 2)	118,948
Balance as of June 30, 2014	127,113
International Medical
Goodwill [Roll Forward]
Balance as of December 31, 2013	6,681
Additional goodwill related to AngioScore acquisition (Note 2)	14,701
Balance as of June 30, 2014	$ 21,382