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INVESTMENTS - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due in one year or less $ 16,177  
Due after one year through five years 342,614  
Due after five years through 10 years 564,926  
Due after 10 years 328,545  
Mtge/ABS/CMBS [1] 369,189  
Total amortized cost 1,621,451 $ 1,596,227
Fair Value    
Due in one year or less 16,009  
Due after one year through five years 349,467  
Due after five years through 10 years 578,370  
Due after 10 years 336,953  
Mtge/ABS/CMBS [1] 370,858  
Total fair value 1,651,657 1,605,209
Fair value measured on recurring basis    
Available-for-sale    
Fair Value 2,039,459 1,974,428
Fair value measured on recurring basis | Significant Unobservable Inputs (Level 3)    
INVESTMENTS    
Total assets at fair value 0  
Debt securities    
Available-for-sale    
Amortized Cost 1,621,451 1,596,227
Gross Unrealized Gains 38,350 26,312
Gross Unrealized Losses (8,144) (17,330)
Fair Value 1,651,657 1,605,209
U.S. government    
Available-for-sale    
Amortized Cost 82,090 77,054
Gross Unrealized Gains 195 88
Gross Unrealized Losses (345) (579)
Fair Value 81,940 76,563
U.S. Agency    
Available-for-sale    
Amortized Cost 5,475 5,473
Gross Unrealized Gains 346 340
Fair Value 5,821 5,813
Non-U.S. govt. & agency    
Available-for-sale    
Amortized Cost 9,504 9,517
Gross Unrealized Gains 121 2
Gross Unrealized Losses (170) (368)
Fair Value 9,455 9,151
Mortgage-backed    
Available-for-sale    
Amortized Cost 289,628 283,002
Gross Unrealized Gains 4,261 4,635
Gross Unrealized Losses (2,908) (3,568)
Fair Value 290,981 284,069
ABS/CMBS    
Available-for-sale    
Amortized Cost [2] 79,561 93,791
Gross Unrealized Gains [2] 688 676
Gross Unrealized Losses [2] (372) (557)
Fair Value [2] 79,877 93,910
Corporate Debt    
Available-for-sale    
Amortized Cost 525,377 503,041
Gross Unrealized Gains 13,448 10,996
Gross Unrealized Losses (2,406) (5,670)
Fair Value 536,419 508,367
Municipal    
Available-for-sale    
Amortized Cost 629,816 624,349
Gross Unrealized Gains 19,291 9,575
Gross Unrealized Losses (1,943) (6,588)
Fair Value 647,164 627,336
Equity securities    
Available-for-sale    
Amortized Cost 193,052 187,573
Gross Unrealized Gains 196,776 182,912
Gross Unrealized Losses (2,026) (1,266)
Fair Value $ 387,802 $ 369,219
[1] Mortgage-backed, asset-backed and commercial mortgage-backed
[2] Non-agency asset-backed and commercial mortgage-backed