Summary Of Significant Accounting Policies (Schedule Of Supplemental Disclosures Of Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Abstract]
Interest	$ 2,446	$ 1	$ 34
Income taxes	2,501	$ 145	$ 3,450
Issuance of common stock for acquisition of On-X intangible assets	$ 34,593