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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | $ 495,192 | $ 961,572
Less than 12 Months Unrealized Loss | (2,527) | (6,345)
12 Months or More Fair Value | 759,792 | 882,865
12 Months or More Unrealized Loss | (15,693) | (23,557)
Total Fair Value | 1,254,984 | 1,844,437
Total Unrealized Loss | (18,220) | (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 | 98 | 97
12 Months or More Unrealized Loss | (1) | (2)
Total Fair Value | 98 | 97
Total Unrealized Loss | (1) | (2)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 6,046 | 0
Less than 12 Months Unrealized Loss | (77) | 0
12 Months or More Fair Value | 13,946 | 16,777
12 Months or More Unrealized Loss | (278) | (233)
Total Fair Value | 19,992 | 16,777
Total Unrealized Loss | (355) | (233)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 12,585 | 186,029
Less than 12 Months Unrealized Loss | (322) | (935)
12 Months or More Fair Value | 239,305 | 264,795
12 Months or More Unrealized Loss | (3,798) | (7,273)
Total Fair Value | 251,890 | 450,824
Total Unrealized Loss | (4,120) | (8,208)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 140,670 | 147,754
Less than 12 Months Unrealized Loss | (264) | (369)
12 Months or More Fair Value | 195,282 | 232,363
12 Months or More Unrealized Loss | (7,138) | (7,597)
Total Fair Value | 335,952 | 380,117
Total Unrealized Loss | (7,402) | (7,966)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 90,610 | 194,795
Less than 12 Months Unrealized Loss | (431) | (1,546)
12 Months or More Fair Value | 212,286 | 240,514
12 Months or More Unrealized Loss | (3,065) | (5,245)
Total Fair Value | 302,896 | 435,309
Total Unrealized Loss | (3,496) | (6,791)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 12,080 | 62,805
Less than 12 Months Unrealized Loss | (30) | (299)
12 Months or More Fair Value | 42,954 | 86,644
12 Months or More Unrealized Loss | (702) | (2,489)
Total Fair Value | 55,034 | 149,449
Total Unrealized Loss | (732) | (2,788)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 224,565 | 336,437
Less than 12 Months Unrealized Loss | (1,325) | (2,312)
12 Months or More Fair Value | 48,376 | 37,105
12 Months or More Unrealized Loss | (465) | (498)
Total Fair Value | 272,941 | 373,542
Total Unrealized Loss | (1,790) | (2,810)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 8,636 | 33,752
Less than 12 Months Unrealized Loss | (78) | (884)
12 Months or More Fair Value | 7,545 | 4,570
12 Months or More Unrealized Loss | (246) | (220)
Total Fair Value | 16,181 | 38,322
Total Unrealized Loss | $ (324) | $ (1,104)

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