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Debt:2030 Notes (Details) - 4.875% Senior Notes Due 2030 [Member] - Senior Notes [Member] - USD ($)
$ in Thousands
6 Months Ended
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%