Acquisition Of On-X Life Technologies (Narrative) (Details) - USD ($) $ in Thousands			11 Months Ended	12 Months Ended
	Jan. 20, 2016	Dec. 22, 2015	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash consideration				$ 1,226
Transaction and integration costs			$ 7,400	$ 7,400
On-X [Member]
Business Acquisition [Line Items]
Revenues			34,200
On-X Agreement [Member]
Business Acquisition [Line Items]
Agreement date				Dec. 22, 2015
Acquisition price	$ 128,200
Close date				Jan. 20, 2016
Total purchase price			$ 128,217	$ 128,217
Cash consideration	$ 93,600
Common shares issued	3,703,699
Common stock consideration	$ 34,600
Escrow deposit, part of payments to acquire business	$ 10,000
Pro forma tax rate				38.00%	38.00%	38.00%
Plan [Member] | On-X Agreement [Member]
Business Acquisition [Line Items]
Acquisition price		$ 130,000