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Senior Notes (Summary of Senior Notes) (Parenthetical) (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2030 | Oct. 27, 2017 | Jul. 31, 2016 | Sep. 30, 2021 | Dec. 31, 2020 | May 31, 2020 | Oct. 31, 2017 | Jul. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 1,113,210 | $ 1,112,409 |  |  |
Senior notes 4.25% due 2024 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  | 4.25% |  |  |  |
Long-term Debt |  |  |  |  |  |  |  | $ 300,000
Debt instrument, maturity date |  |  |  | Jul. 31, 2024 |  |  |  |
Redemption price, percentage of principal amount |  |  |  | 100.00% |  |  |  |
Additional issuance of long-term debt |  |  | $ 200,000 |  |  |  |  |
Senior notes 4.00% due 2030 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  | 4.00% |  |  |  |
Long-term Debt |  |  |  |  |  | $ 400,000 |  |
Debt instrument, maturity date |  |  |  | May 31, 2030 |  |  |  |
Senior notes 4.00% due 2030 [Member] | After February 15, 2030 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount |  |  |  | 100.00% |  |  |  |
Senior notes 4.00% due 2030 [Member] | Measurement Input, Discount Rate [Member] | Prior to February 15, 2030 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption at treasury rate basis point |  |  |  | 0.50% |  |  |  |
Senior notes 4.00% due 2030 [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount | 100.00% |  |  |  |  |  |  |
Senior notes 5.20% due 2047 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  | 5.20% |  |  |  |
Long-term Debt |  |  |  |  |  |  | $ 200,000 |
Debt instrument, maturity date |  |  |  | Oct. 31, 2047 |  |  |  |
Redemption price, percentage of principal amount |  |  |  | 100.00% |  |  |  |
Additional issuance of long-term debt |  | $ 25,000 |  |  |  |  |  |

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