Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivatives, Net liability position | $ 0 | |
| 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 | 585,000,000 | |
| Ineffective gain (loss) in interest expense | 0 | $ 74,000 |
| Estimated additional amount to be reclassified to interest expense | 4,500,000 | |
| Notional Value | $ 90,000,000 | |