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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | $ 1,838,375 | $ 570,095
Less than 12 Months Unrealized Loss | (21,924) | (4,745)
12 Months or More Fair Value | 370,966 | 335,516
12 Months or More Unrealized Loss | (17,045) | (8,881)
Total Fair Value | 2,209,341 | 905,611
Total Unrealized Loss | (38,969) | (13,626)
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 95 | 97
Less than 12 Months Unrealized Loss | (3) | (1)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 95 | 97
Total Unrealized Loss | (3) | (1)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 19,890 | 11,092
Less than 12 Months Unrealized Loss | (311) | (76)
12 Months or More Fair Value | 5,379 | 0
12 Months or More Unrealized Loss | (141) | 0
Total Fair Value | 25,269 | 11,092
Total Unrealized Loss | (452) | (76)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 488,725 | 175,183
Less than 12 Months Unrealized Loss | (5,650) | (1,109)
12 Months or More Fair Value | 129,218 | 108,782
12 Months or More Unrealized Loss | (6,017) | (3,025)
Total Fair Value | 617,943 | 283,965
Total Unrealized Loss | (11,667) | (4,134)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 278,366 | 132,818
Less than 12 Months Unrealized Loss | (5,414) | (1,713)
12 Months or More Fair Value | 88,624 | 72,139
12 Months or More Unrealized Loss | (5,148) | (2,704)
Total Fair Value | 366,990 | 204,957
Total Unrealized Loss | (10,562) | (4,417)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 628,667 | 164,909
Less than 12 Months Unrealized Loss | (6,910) | (1,138)
12 Months or More Fair Value | 99,142 | 101,436
12 Months or More Unrealized Loss | (4,078) | (2,325)
Total Fair Value | 727,809 | 266,345
Total Unrealized Loss | (10,988) | (3,463)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 186,269 | 38,450
Less than 12 Months Unrealized Loss | (2,195) | (507)
12 Months or More Fair Value | 27,441 | 21,639
12 Months or More Unrealized Loss | (1,143) | (435)
Total Fair Value | 213,710 | 60,089
Total Unrealized Loss | (3,338) | (942)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 219,064 | 44,941
Less than 12 Months Unrealized Loss | (1,215) | (200)
12 Months or More Fair Value | 13,591 | 24,396
12 Months or More Unrealized Loss | (139) | (106)
Total Fair Value | 232,655 | 69,337
Total Unrealized Loss | (1,354) | (306)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 17,299 | 2,605
Less than 12 Months Unrealized Loss | (226) | (1)
12 Months or More Fair Value | 7,571 | 7,124
12 Months or More Unrealized Loss | (379) | (286)
Total Fair Value | 24,870 | 9,729
Total Unrealized Loss | $ (605) | $ (287)

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