Acquisition Of On-X Life Technologies (Narrative) (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 20, 2016	Jun. 30, 2016	Dec. 22, 2015
Business Acquisition [Line Items]
Cash consideration		$ 1,226
On-X Agreement [Member]
Business Acquisition [Line Items]
Acquisition agreement date		Dec. 22, 2015
Total consideration	$ 128,217
Cash consideration	$ 93,600
Common shares issued	3,703,699
Common stock consideration	$ 34,600
Acquisition effective date		Jan. 20, 2016
Transaction and integration costs		$ 6,500
Scenario, Plan [Member] | On-X Agreement [Member]
Business Acquisition [Line Items]
Total consideration			$ 130,000