Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Collateral for fair value of assets | $ 0 | |
| Credit Risk Contract [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Net liability | 0 | |
| Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative notional amount | 0 | |
| Estimated additional amount to be reclassified to interest expense | 0 | |
| Interest And Other Investment Income (Loss) [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Reclassification of a gain | $ 0 | $ 1,279,000 |