Annual report pursuant to Section 13 and 15(d)

Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Cash Flow Hedging, Derivative Financial Instruments On The Income Statement) (Details)

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Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Cash Flow Hedging, Derivative Financial Instruments On The Income Statement) (Details) - Not Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ (2,381) $ (3,398)
Interest And Other Investment Income (Loss) [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion, Reclassification for Forecasted Transactions No Longer Probable of Occurring and Amount Excluded from Effectiveness Testing) (37) 631
Interest Rate Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) $ 2,869 $ (1,183)