Acquisition Of On-X Life Technologies (Narrative) (Details) - On-X Agreement [Member] - USD ($) $ in Thousands			6 Months Ended		11 Months Ended
	Jan. 20, 2016	Dec. 22, 2015	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Agreement date			Dec. 22, 2015
Acquisition price	$ 128,200
Close date			Jan. 20, 2016
Total purchase price	128,217
Cash consideration	$ 93,600
Common shares issued	3,703,699
Common stock consideration	$ 34,600
Transaction and integration costs					$ 7,400
Escrow deposit, part of payments to acquire business	$ 10,000
Revenues					$ 34,200
Pro forma tax rate			38.00%	38.00%
Plan [Member]
Business Acquisition [Line Items]
Acquisition price		$ 130,000