Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| 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 | 675,000,000 | ||
| Ineffective gain (loss) in interest expense | (200,000) | $ (37,000) | $ 600,000 |
| Estimated additional amount to be reclassified to interest expense | $ 6,700,000 | ||
| Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Amount of increase in the fair value of derivatives | $ 2,000 | ||