Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Fair Value Of The Derivative Financial Instruments) (Details) - Deferred Charges, Goodwill And Other Assets [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Asset Derivatives | $ 2,847 | |
| Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Asset Derivatives | $ 2 |