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Senior Notes (Summary of Senior Notes) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2020 | Oct. 31, 2017 | Jul. 31, 2014
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross |  | $ 1,125,000 | $ 1,125,000 |  |  |
Debt issuance costs, net |  | (9,371) | (10,446) |  |  |
Senior notes, net |  | 1,115,629 | 1,114,554 |  |  |
Senior notes 4.25% due 2024 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross | [1] | 500,000 | 500,000 |  |  |
Senior notes, net |  |  |  |  |  | $ 300,000
Senior notes 4.00% due 2030 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross | [2] | 400,000 | 400,000 |  |  |
Senior notes, net |  |  |  | $ 400,000 |  |
Senior notes 5.20% due 2047 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, gross | [3] | $ 225,000 | $ 225,000 |  |  |
Senior notes, net |  |  |  |  | $ 200,000 |
[1] | In July 2014, we sold in a registered underwritten public offering, $300.0 million in aggregate principal amount of 4.25% senior notes due July 2024. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to 100% of their principal amount, plus a “make-whole” premium and accrued and unpaid interest, if any, to the date of redemption. In July 2016, we issued an additional $200.0 million in aggregate principal amount of 4.25% senior notes due 2024.
[2] | In May 2020, we sold in a registered underwritten public offering, $400.0 million in aggregate principal amount of 4.00% senior notes due May 2030. Interest on these senior notes is payable semi-annually in arrears. We may redeem the notes in whole or in part, at our option, at a redemption price equal to the greater of a) 100% of their principal amount, or b) discounted present value at Treasury rate plus 50 basis points prior to February 15, 2030, and on or after February 15, 2030, at 100% of their principal amount, and accrued and unpaid interest, if any, to the date of redemption.
[3] | In October 2017, we completed the pricing of a registered underwritten public offering of $200.0 million in aggregate principal amount of 5.20% senior notes due October 2047. Interest on the senior notes is payable quarterly in arrears. We may redeem some or all of the senior notes at any time at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date. On October 27, 2017, we completed the sale of an additional $25.0 million aggregate principal amount of Notes pursuant to the over-allotment option.

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