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Borrowings - Convertible Notes, Narrative (Details)
9 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
Aug. 15, 2023
USD ($)
Nov. 02, 2022
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Mar. 14, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 09, 2022
USD ($)
Dec. 06, 2022
USD ($)
Nov. 04, 2022
USD ($)
Jun. 07, 2019
USD ($)
Aug. 31, 2018
USD ($)
Aug. 30, 2018
USD ($)
Aug. 20, 2018
USD ($)
Debt Instrument [Line Items]                            
Face amount $ 300,000,000     $ 300,000,000                    
Repayment of Convertible Notes       $ 116,816,000 $ 0                  
2022 Convertible Notes                            
Debt Instrument [Line Items]                            
Increases in dividend in excess (in dollars per share) | $ / shares $ 0.30     $ 0.30                    
Conversion price (in dollars per share) | $ / shares $ 14.03   $ 14.20 14.03                    
Conversion rate 71.2860   70.4225                      
Minimum | 2022 Convertible Notes                            
Debt Instrument [Line Items]                            
Conversion price (in dollars per share) | $ / shares $ 12.38     $ 12.38                    
Maximum | 2022 Convertible Notes                            
Debt Instrument [Line Items]                            
Conversion rate       80.7754                    
Convertible Notes | 2018 Convertible Notes                            
Debt Instrument [Line Items]                            
Face amount                     $ 86,250,000 $ 115,000,000 $ 15,000,000 $ 100,000,000
Stated interest rate 5.75%     5.75%                    
Maximum purchase amount                   $ 201,250,000        
Purchase amount per $1,000 principal amount                   $ 1,000        
Purchase amount                 $ 84,434,000          
Outstanding balance $ 0     $ 0     $ 116,816,000 $ 116,816,000            
Repayment of Convertible Notes   $ 116,816,000                        
Convertible Notes | 2022 Convertible Notes                            
Debt Instrument [Line Items]                            
Face amount     $ 200,000,000     $ 60,000,000                
Stated interest rate 7.50%     7.50%                    
Outstanding balance $ 260,000,000     $ 260,000,000     $ 200,000,000              
Redemption as a percentage of principal       100.00%