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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value $ 404,445 $ 961,572
Less than 12 Months Unrealized Loss (1,276) (6,345)
12 Months or More Fair Value 426,899 882,865
12 Months or More Unrealized Loss (6,261) (23,557)
Total Fair Value 831,344 1,844,437
Total Unrealized Loss (7,537) (29,902)
U.S. Treasuries    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 0 0
Less than 12 Months Unrealized Loss 0 0
12 Months or More Fair Value 0 97
12 Months or More Unrealized Loss 0 (2)
Total Fair Value 0 97
Total Unrealized Loss 0 (2)
Securities of U.S. government agencies and corporations    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 0 0
Less than 12 Months Unrealized Loss 0 0
12 Months or More Fair Value 8,985 16,777
12 Months or More Unrealized Loss (139) (233)
Total Fair Value 8,985 16,777
Total Unrealized Loss (139) (233)
Residential Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 10,507 186,029
Less than 12 Months Unrealized Loss (67) (935)
12 Months or More Fair Value 131,539 264,795
12 Months or More Unrealized Loss (1,288) (7,273)
Total Fair Value 142,046 450,824
Total Unrealized Loss (1,355) (8,208)
Commercial Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 99,535 147,754
Less than 12 Months Unrealized Loss (197) (369)
12 Months or More Fair Value 91,179 232,363
12 Months or More Unrealized Loss (2,939) (7,597)
Total Fair Value 190,714 380,117
Total Unrealized Loss (3,136) (7,966)
Collateralized Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 50,381 194,795
Less than 12 Months Unrealized Loss (103) (1,546)
12 Months or More Fair Value 94,939 240,514
12 Months or More Unrealized Loss (609) (5,245)
Total Fair Value 145,320 435,309
Total Unrealized Loss (712) (6,791)
Obligations of state and other political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 19,676 62,805
Less than 12 Months Unrealized Loss (38) (299)
12 Months or More Fair Value 14,123 86,644
12 Months or More Unrealized Loss (183) (2,489)
Total Fair Value 33,799 149,449
Total Unrealized Loss (221) (2,788)
Asset-backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 218,191 336,437
Less than 12 Months Unrealized Loss (829) (2,312)
12 Months or More Fair Value 80,710 37,105
12 Months or More Unrealized Loss (776) (498)
Total Fair Value 298,901 373,542
Total Unrealized Loss (1,605) (2,810)
Other securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 6,155 33,752
Less than 12 Months Unrealized Loss (42) (884)
12 Months or More Fair Value 5,424 4,570
12 Months or More Unrealized Loss (327) (220)
Total Fair Value 11,579 38,322
Total Unrealized Loss $ (369) $ (1,104)