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Debt (Issuance of 4.50% Senior Notes and Repurchase and Redemption of 4.875% Senior Notes) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended | 36 Months Ended | 96 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 19, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 15, 2023 | Aug. 15, 2028 | Aug. 04, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of 4.875% senior notes |  |  | $ 400,000 | $ 0 | $ 0 |  |  |
Loss on extinguishment of debt |  | $ (5,600) | $ (5,569) | $ 0 | $ 0 |  |  |
Senior Notes [Member] | 4.50% Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 600,000
Debt instrument, maturity date |  |  | Aug. 15, 2028 |  |  |  |  |
Debt instrument, interest rate (percentage) |  |  | 4.50% |  |  |  |  |
Debt issuance costs, gross |  |  | $ 8,900 |  |  |  |  |
Senior Notes [Member] | 4.50% Senior Notes [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price (percentage) |  |  |  |  |  | 100.00% |  |
Debt instrument, redemption price, percentage of principal amount redeemed |  |  |  |  |  | 40.00% |  |
Debt instrument redemption price percentage with equity offerings |  |  |  |  |  | 104.50% |  |
Debt instrument, change of control, redemption price, percent |  |  |  |  |  |  | 101.00% |
Debt instrument, minimum percentage of principal required to redeem in the event of default |  |  |  |  |  |  | 30.00% |
Senior Notes [Member] | 4.875% Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Mar. 15, 2023 |  |  |  |  |
Debt instrument, interest rate (percentage) |  |  | 4.875% |  |  |  |  |
Repayments of 4.875% senior notes | $ 400,000 |  |  |  |  |  |  |
Debt instrument, redemption price (percentage) | 100.813% |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 5,600 |  |  |  |  |
Payment for debt extinguishment, call premiums |  |  | 3,300 |  |  |  |  |
Write off of deferred debt issuance cost |  |  | $ 2,300 |  |  |  |  |

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