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Debt:2030 Notes (Details) - 4.875% Senior Notes Due 2030 [Member] - Senior Notes [Member] - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2021 | Jul. 27, 2020
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount |  | $ 400,000
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875%
Dividend restriction, interest coverage ratio (as a percent) | 350.00% |

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