International Retirement Plan (Summary Of Amounts Recognized In Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 6,211	$ 7,062
International Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	117	132
Other liabilities	6,211	7,062
Projected benefit obligation	6,328	7,194	$ 5,987
Accumulated other comprehensive loss	(1,873)	(2,211)
Total	$ 4,455	$ 4,983