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Notes Payable (2027 Notes Narrative) (Details) - June 2027 Notes - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Jun. 16, 2017
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500,000 $ 500,000 $ 500,000
Interest rate     5.00%
Unamortized discount $ 204 $ 213 $ 300
Debt financing costs     $ 5,800