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Convertible Notes, Net - Narrative (Details)
1 Months Ended 12 Months Ended
May 31, 2018
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
May 15, 2018
$ / shares
Debt Instrument [Line Items]          
Affiliate expenses   $ 31,202,000 $ 25,434,000 $ 21,876,000  
Accrued interest payable   $ 6,627,000 5,381,000    
Notes Due in 2023          
Debt Instrument [Line Items]          
Debt instrument, interest rate, effective percentage   6.92%      
Convertible Notes Payable          
Debt Instrument [Line Items]          
Principal   $ 143,750,000 143,750,000    
Deferred financing costs   $ 1,405,000 2,431,000    
Convertible Notes Payable | Notes Due in 2023          
Debt Instrument [Line Items]          
Principal $ 143,750,000        
Debt instrument, interest rate, stated percentage 6.125% 6.125%      
Deferred financing costs $ 5,100,000        
Debt instrument, conversion ratio 0.0439386        
Debt Instrument, convertible, conversion price (usd per share) | $ / shares $ 22.76        
Debt instrument, convertible, conversion premium 10.00%        
Debt instrument, convertible, conversion price less premium (usd per share) | $ / shares         $ 20.69
Amortization of debt discount $ 1,800,000        
Debt instrument, interest rate, effective percentage 6.50%        
Accrued interest payable   $ 1,100,000 $ 1,100,000    
KKR Credit & Markets | Convertible debt          
Debt Instrument [Line Items]          
Affiliate expenses $ 800,000