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Investments - Schedule of Fixed Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 2,985,637  
Unrealized Losses (30,825) $ (4,514)
Fair Value 2,985,443 1,340,626
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,985,637 1,266,571
Unrealized Gains 30,631 78,378
Unrealized Losses (30,825) (4,323)
Fair Value 2,985,443 1,340,626
U.S. Government and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 28,491 15,283
Unrealized Gains 225 470
Unrealized Losses (158) (31)
Fair Value 28,558 15,722
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 413,554 377,549
Unrealized Gains 5,678 18,953
Unrealized Losses (2,842) (1,052)
Fair Value 416,390 395,450
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   6,331
Unrealized Gains   0
Unrealized Losses   (333)
Fair Value   5,998
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 98,420 101,974
Unrealized Gains 3,229 4,185
Unrealized Losses (972) (1,264)
Fair Value 100,677 104,895
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 60,735 30,152
Unrealized Gains 144 269
Unrealized Losses (509) (16)
Fair Value 60,370 30,405
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 287,497 145,479
Unrealized Gains 1,078 2,610
Unrealized Losses (2,776) (163)
Fair Value 285,799 147,926
Corporate and other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,096,940 589,803
Unrealized Gains 20,277 51,891
Unrealized Losses (23,568) (1,464)
Fair Value $ 2,093,649 $ 640,230