Certain Relationships And Related Party Transactions (Components Of Net Transfers) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Certain Relationships And Related Party Transactions [Abstract] | ||||
| Cash pooling | $ (5,426) | $ (34,171) | $ 81,581 | $ (72,714) |
| Corporate overhead allocations | 4,767 | 5,445 | 12,694 | 16,712 |
| Asset transfers | 75,175 | 75,320 | ||
| Net transfers from (to) Parent | $ 74,516 | $ (28,726) | $ 169,595 | $ (56,002) |