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] - Interest Rate Swaps [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Derivative Instruments, Gain (Loss) [Line Items] | ||
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) | $ 5,226 | $ 635 |
Interest Expense [Member] | ||
Derivative Instruments, Gain (Loss) [Line Items] | ||
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 80 | (592) |
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) | $ (74) | $ (43) |