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INVESTMENTS - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due in one year or less $ 21,240  
Due after one year through five years 339,233  
Due after five years through 10 years 571,384  
Due after 10 years 343,618  
Mtge/ABS/CMBS [1] 404,846  
Total amortized cost 1,680,321 $ 1,596,227
Fair Value    
Due in one year or less 20,984  
Due after one year through five years 346,408  
Due after five years through 10 years 586,385  
Due after 10 years 353,234  
Mtge/ABS/CMBS [1] 406,547  
Total fair value 1,713,558 1,605,209
Fair value measured on recurring basis    
Available-for-sale    
Fair Value 2,106,771 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 1,680,321 1,596,227
Gross Unrealized Gains 40,298 26,312
Gross Unrealized Losses (7,061) (17,330)
Fair Value 1,713,558 1,605,209
U.S. government    
Available-for-sale    
Amortized Cost 88,660 77,054
Gross Unrealized Gains 159 88
Gross Unrealized Losses (374) (579)
Fair Value 88,445 76,563
U.S. Agency    
Available-for-sale    
Amortized Cost 13,482 5,473
Gross Unrealized Gains 350 340
Gross Unrealized Losses (86)  
Fair Value 13,746 5,813
Non-U.S. govt. & agency    
Available-for-sale    
Amortized Cost 9,497 9,517
Gross Unrealized Gains 185 2
Gross Unrealized Losses (46) (368)
Fair Value 9,636 9,151
Mortgage-backed    
Available-for-sale    
Amortized Cost 330,257 283,002
Gross Unrealized Gains 4,254 4,635
Gross Unrealized Losses (2,953) (3,568)
Fair Value 331,558 284,069
ABS/CMBS    
Available-for-sale    
Amortized Cost [2] 74,589 93,791
Gross Unrealized Gains [2] 616 676
Gross Unrealized Losses [2] (216) (557)
Fair Value [2] 74,989 93,910
Corporate Debt    
Available-for-sale    
Amortized Cost 532,893 503,041
Gross Unrealized Gains 14,496 10,996
Gross Unrealized Losses (2,034) (5,670)
Fair Value 545,355 508,367
Municipal    
Available-for-sale    
Amortized Cost 630,943 624,349
Gross Unrealized Gains 20,238 9,575
Gross Unrealized Losses (1,352) (6,588)
Fair Value 649,829 627,336
Equity securities    
Available-for-sale    
Amortized Cost 189,212 187,573
Gross Unrealized Gains 205,693 182,912
Gross Unrealized Losses (1,692) (1,266)
Fair Value $ 393,213 $ 369,219
[1] Mortgage-backed, asset-backed and commercial mortgage-backed
[2] Non-agency asset-backed and commercial mortgage-backed