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Investments - Unrealized Loss Position (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value    
Less Than 12 Months $ 290,187 $ 601,135
Greater Than 12 Months 200,992 850,337
Total Fair Value 491,179 1,451,472
Unrealized Losses    
Less Than 12 Months (3,930) (15,578)
Greater Than 12 Months (3,194) (34,470)
Total Unrealized Losses $ (7,124) $ (50,048)
Fixed income securities, unrealized loss position 313 708
OTTI charges in realized investment (losses) gains, net $ 0 $ 1,500
U.S. Treasury securities    
Fair Value    
Less Than 12 Months   8,263
Greater Than 12 Months 7,469 69,727
Total Fair Value 7,469 77,990
Unrealized Losses    
Less Than 12 Months   (82)
Greater Than 12 Months (14) (1,935)
Total Unrealized Losses (14) (2,017)
Government agency securities    
Fair Value    
Less Than 12 Months 3,192  
Total Fair Value 3,192  
Unrealized Losses    
Less Than 12 Months (14)  
Total Unrealized Losses (14)  
Corporate debt securities    
Fair Value    
Less Than 12 Months 133,341 393,931
Greater Than 12 Months 50,695 710,482
Total Fair Value 184,036 1,104,413
Unrealized Losses    
Less Than 12 Months (2,509) (10,241)
Greater Than 12 Months (516) (29,897)
Total Unrealized Losses (3,025) (40,138)
Municipal debt obligations    
Fair Value    
Less Than 12 Months 66,355  
Greater Than 12 Months   6,085
Total Fair Value 66,355 6,085
Unrealized Losses    
Less Than 12 Months (766)  
Greater Than 12 Months   (153)
Total Unrealized Losses (766) (153)
ABS    
Fair Value    
Less Than 12 Months 27,884 25,258
Greater Than 12 Months 11,165 4,249
Total Fair Value 39,049 29,507
Unrealized Losses    
Less Than 12 Months (175) (61)
Greater Than 12 Months (165) (56)
Total Unrealized Losses (340) (117)
CLO    
Fair Value    
Less Than 12 Months 28,485 146,004
Greater Than 12 Months 110,825  
Total Fair Value 139,310 146,004
Unrealized Losses    
Less Than 12 Months (338) (4,668)
Greater Than 12 Months (1,942)  
Total Unrealized Losses (2,280) (4,668)
CMBS    
Fair Value    
Less Than 12 Months 18,307  
Greater Than 12 Months 6,053 53,843
Total Fair Value 24,360 53,843
Unrealized Losses    
Less Than 12 Months (102)  
Greater Than 12 Months (45) (2,137)
Total Unrealized Losses (147) (2,137)
RMBS - non-agency    
Fair Value    
Less Than 12 Months 2,173 529
Greater Than 12 Months 2,418 2,449
Total Fair Value 4,591 2,978
Unrealized Losses    
Less Than 12 Months (14) (13)
Greater Than 12 Months (177) (108)
Total Unrealized Losses (191) (121)
RMBS - agency    
Fair Value    
Less Than 12 Months 10,450 27,150
Greater Than 12 Months 12,367 3,502
Total Fair Value 22,817 30,652
Unrealized Losses    
Less Than 12 Months (12) (513)
Greater Than 12 Months (335) (184)
Total Unrealized Losses $ (347) $ (697)