Financial Instruments (Effect Of Derivatives on the Consolidated Statement of Operations) (Details) - Derivatives designated as hedging instruments [Member] - Interest rate contracts [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net gain recognized in income from fair value hedges		$ 1,534	$ 979	$ 960
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain on hedging instrument	[1]	$ 1,534	$ 979	$ 960

[1] The realized gain on hedging instruments consist of net cash settlements and interest accruals on the interest rate swaps during the period, which are recognized in interest expense.