Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Credit Risk Contract [Member] | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Net liability | $ 8,000,000 | $ 8,000,000 | ||
| Settlement obligation | 8,000,000 | 8,000,000 | ||
| Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Derivative notional amount | 350,000,000 | 350,000,000 | ||
| Ineffective increase to interest expense | 1,012,000 | 0 | ||
| Estimated additional amount to be reclassified to interest expense | 2,700,000 | |||
| 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 | $ 0 | $ 12,000 | $ 2,000 | $ 92,000 |