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Notes Payable and Amounts Due Under Repurchase Agreements (2027 Notes Narrative) (Details) - June 2027 Notes - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Jun. 16, 2017
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500,000 $ 500,000 $ 500,000
Interest rate     5.00%
Unamortized discount $ 213 $ 246 $ 300
Deferred financing costs     $ 5,800