Senior Unsecured Notes (Summary Of Senior Unsecured Notes) (Details) - USD ($)
|
|
9 Months Ended |
|
May 06, 2021 |
Sep. 30, 2021 |
Dec. 31, 2020 |
| Debt Instrument [Line Items] |
|
|
|
| Principal balance outstanding |
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$ 2,374,947,000
|
$ 2,801,797,000
|
| Total debt |
|
$ 2,374,947,000
|
2,801,797,000
|
| 4.500% Senior Unsecured Notes Due April 18, 2022 [Member] |
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|
|
| Debt Instrument [Line Items] |
|
|
|
| Interest rate of senior unsecured notes |
|
4.50%
|
|
| Maturity date of the senior unsecured notes |
|
Apr. 18, 2022
|
|
| 3.150% Senior Unsecured Notes, Due May 15, 2023 [Member] |
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|
|
| Debt Instrument [Line Items] |
|
|
|
| Interest rate of senior unsecured notes |
|
3.15%
|
|
| Maturity date of the senior unsecured notes |
|
May 15, 2023
|
|
| Senior Unsecured Notes [Member] |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Principal balance outstanding |
|
|
575,000,000
|
| Adjustment for unamortized debt discount |
|
|
(1,504,000)
|
| Unamortized deferred financing costs |
|
|
(843,000)
|
| Total debt |
|
|
572,653,000
|
| Extinguishment of debt |
$ 24,200,000
|
|
|
| Senior Unsecured Notes [Member] | 4.500% Senior Unsecured Notes Due April 18, 2022 [Member] |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Principal balance outstanding |
|
|
300,000,000
|
| Senior Unsecured Notes [Member] | 3.150% Senior Unsecured Notes, Due May 15, 2023 [Member] |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Principal balance outstanding |
|
|
$ 275,000,000
|