Goodwill And Other Intangible Assets (Schedule Of Carrying Values Of Indefinite Lived Intangible Assets)(Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 78,294	$ 11,365	$ 11,365
Total indefinite lived intangible assets	81,148	14,238
Procurement Contracts And Agreements [Member]
Indefinite-lived Intangible Assets [Line Items]
Total indefinite lived intangible assets	2,013	2,013
Trademarks [Member]
Indefinite-lived Intangible Assets [Line Items]
Total indefinite lived intangible assets	$ 841	$ 860