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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | $ 1,920,376 | $ 570,095
Less than 12 Months Unrealized Loss | (28,443) | (4,745)
12 Months or More Fair Value | 494,421 | 335,516
12 Months or More Unrealized Loss | (23,936) | (8,881)
Total Fair Value | 2,414,797 | 905,611
Total Unrealized Loss | (52,379) | (13,626)
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 0 | 97
Less than 12 Months Unrealized Loss | 0 | (1)
12 Months or More Fair Value | 95 | 0
12 Months or More Unrealized Loss | (4) | 0
Total Fair Value | 95 | 97
Total Unrealized Loss | (4) | (1)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 19,546 | 11,092
Less than 12 Months Unrealized Loss | (411) | (76)
12 Months or More Fair Value | 5,332 | 0
12 Months or More Unrealized Loss | (189) | 0
Total Fair Value | 24,878 | 11,092
Total Unrealized Loss | (600) | (76)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 431,332 | 175,183
Less than 12 Months Unrealized Loss | (8,695) | (1,109)
12 Months or More Fair Value | 141,519 | 108,782
12 Months or More Unrealized Loss | (7,182) | (3,025)
Total Fair Value | 572,851 | 283,965
Total Unrealized Loss | (15,877) | (4,134)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 281,842 | 132,818
Less than 12 Months Unrealized Loss | (3,637) | (1,713)
12 Months or More Fair Value | 151,185 | 72,139
12 Months or More Unrealized Loss | (8,387) | (2,704)
Total Fair Value | 433,027 | 204,957
Total Unrealized Loss | (12,024) | (4,417)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 658,749 | 164,909
Less than 12 Months Unrealized Loss | (10,407) | (1,138)
12 Months or More Fair Value | 133,153 | 101,436
12 Months or More Unrealized Loss | (5,756) | (2,325)
Total Fair Value | 791,902 | 266,345
Total Unrealized Loss | (16,163) | (3,463)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 304,298 | 38,450
Less than 12 Months Unrealized Loss | (3,976) | (507)
12 Months or More Fair Value | 37,683 | 21,639
12 Months or More Unrealized Loss | (1,936) | (435)
Total Fair Value | 341,981 | 60,089
Total Unrealized Loss | (5,912) | (942)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 206,708 | 44,941
Less than 12 Months Unrealized Loss | (1,125) | (200)
12 Months or More Fair Value | 20,776 | 24,396
12 Months or More Unrealized Loss | (374) | (106)
Total Fair Value | 227,484 | 69,337
Total Unrealized Loss | (1,499) | (306)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 17,901 | 2,605
Less than 12 Months Unrealized Loss | (192) | (1)
12 Months or More Fair Value | 4,678 | 7,124
12 Months or More Unrealized Loss | (108) | (286)
Total Fair Value | 22,579 | 9,729
Total Unrealized Loss | $ (300) | $ (287)

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