Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Fair Value Of The Derivative Financial Instruments) (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Deferred Charges, Goodwill And Other Assets [Member] | Cash Flow Hedging [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Asset Derivatives | $ 8,060 | $ 2,847 |