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Unsecured Senior Notes - Convertible Notes (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
Unsecured Senior Notes  
Principal amount of notes, basis for conversion | $ $ 1,000
Closing share price (in dollars per share) $ 24.17
2023 Convertible Notes  
Unsecured Senior Notes  
Conversion Rate 38.5959
Conversion price (in dollars per share) $ 25.91