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Investments - Securities In Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value $ 1,468,423 $ 300,911
12 Months or Greater - Fair Value 40,914 80,269
Total - Fair Value 1,509,337 381,180
Less Than 12 Months - Unrealized Losses (32,408) (3,827)
12 Months or Greater - Unrealized Losses (1,395) (832)
Total - Unrealized Losses (33,803) (4,659)
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 57,006 2,690
12 Months or Greater - Fair Value 0 0
Total - Fair Value 57,006 2,690
Less Than 12 Months - Unrealized Losses (222) (2)
12 Months or Greater - Unrealized Losses 0 0
Total - Unrealized Losses (222) (2)
Obligations of U.S. states and political subdivisions    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 522,476 31,416
12 Months or Greater - Fair Value 0 0
Total - Fair Value 522,476 31,416
Less Than 12 Months - Unrealized Losses (14,727) (256)
12 Months or Greater - Unrealized Losses 0 0
Total - Unrealized Losses (14,727) (256)
Corporate debt securities    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 580,879 44,968
12 Months or Greater - Fair Value 0 0
Total - Fair Value 580,879 44,968
Less Than 12 Months - Unrealized Losses (14,990) (1,728)
12 Months or Greater - Unrealized Losses 0 0
Total - Unrealized Losses (14,990) (1,728)
ABS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 50,656 14,929
12 Months or Greater - Fair Value 0 0
Total - Fair Value 50,656 14,929
Less Than 12 Months - Unrealized Losses (222) (18)
12 Months or Greater - Unrealized Losses 0 0
Total - Unrealized Losses (222) (18)
RMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 127,663 98,409
12 Months or Greater - Fair Value 3,254 3,566
Total - Fair Value 130,917 101,975
Less Than 12 Months - Unrealized Losses (1,387) (773)
12 Months or Greater - Unrealized Losses (23) (65)
Total - Unrealized Losses (1,410) (838)
CMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 70,193 13,212
12 Months or Greater - Fair Value 13,150 2,799
Total - Fair Value 83,343 16,011
Less Than 12 Months - Unrealized Losses (749) (789)
12 Months or Greater - Unrealized Losses (1,331) (336)
Total - Unrealized Losses (2,080) (1,125)
CLOs    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 55,161 95,287
12 Months or Greater - Fair Value 24,510 73,904
Total - Fair Value 79,671 169,191
Less Than 12 Months - Unrealized Losses (15) (261)
12 Months or Greater - Unrealized Losses (41) (431)
Total - Unrealized Losses (56) $ (692)
Foreign government debt    
Schedule of Investments [Line Items]    
Less Than 12 Months - Fair Value 4,389  
12 Months or Greater - Fair Value 0  
Total - Fair Value 4,389  
Less Than 12 Months - Unrealized Losses (96)  
12 Months or Greater - Unrealized Losses 0  
Total - Unrealized Losses $ (96)