Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Fair Value Of The Derivative Financial Instruments) (Details) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Deferred Charges, Goodwill And Other Assets [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Asset Derivatives | $ 3,102 | $ 2,847 |
| Accounts Payable, Accrued Expenses And Other Liabilities [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Liability Derivatives | $ 413 |