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Debt:2024 Notes (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 01, 2020 | Jul. 27, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 29, 2016
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Loss on Extinguishment of Debt |  |  |  | $ (13,968) | $ 0 | $ 0 |
5.625% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 137,500 | $ 212,500 |  | 350,000 |  |  |
Loss on Extinguishment of Debt |  |  | $ (14,000) | (14,000) |  |  |
Debt extinguishment premiums paid |  |  |  | 10,800 |  |  |
Write off of Unamortized Deferred Financing Cost |  |  |  | $ 3,200 |  |  |
5.625% Senior Notes Due 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 350,000
Interest rate |  |  |  |  |  |  | 5.625%
4.875% Senior Notes Due 2030 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 400,000 |  |  |  |  |
Interest rate |  | 4.875% |  |  |  |  |

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