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Investments - Amortized Cost and Fair Values of Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized cost    
Due in one year or less $ 372,100  
Due after one year through five years 1,964,439  
Due after five years through ten years 1,463,849  
Due after ten years 1,478,618  
Total debt securities with single maturity date, amortized cost 5,279,006  
Amortized Cost 6,586,020 $ 6,317,164
Fair Value    
Due in one year or less 376,608  
Due after one year through five years 2,033,836  
Due after five years through ten years 1,538,784  
Due after ten years 1,537,764  
Total debt securities with single maturity date, fair value 5,486,992  
Total at end of period 6,811,318 6,661,596
ABS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 185,394  
Amortized Cost 185,394 203,807
Fair Value    
Total debt securities without single maturity date, fair value 187,141  
Total at end of period 187,141 206,686
RMBS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 432,148  
Amortized Cost 432,148 425,532
Fair Value    
Total debt securities without single maturity date, fair value 436,008  
Total at end of period 436,008 431,166
CMBS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 317,055  
Amortized Cost 317,055 312,572
Fair Value    
Total debt securities without single maturity date, fair value 327,850  
Total at end of period 327,850 327,502
CLOs    
Amortized cost    
Total debt securities without single maturity date, amortized cost 372,417  
Amortized Cost 372,417 310,616
Fair Value    
Total debt securities without single maturity date, fair value 373,327  
Total at end of period $ 373,327 $ 310,490