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INVESTMENTS - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Amortized Cost    
Due in one year or less $ 14,302  
Due after one year through five years 357,017  
Due after five years through 10 years 516,586  
Due after 10 years 325,132  
Mtge/ABS/CMBS [1] 359,872  
Total amortized cost 1,572,909 $ 1,596,227
Fair Value    
Due in one year or less 14,298  
Due after one year through five years 363,349  
Due after five years through 10 years 523,913  
Due after 10 years 327,933  
Mtge/ABS/CMBS [1] 360,906  
Total fair value 1,590,399 1,605,209
Fair value measured on recurring basis    
Available-for-sale    
Fair Value 1,974,328 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 1,572,909 1,596,227
Gross Unrealized Gains 29,684 26,312
Gross Unrealized Losses (12,194) (17,330)
Fair Value 1,590,399 1,605,209
U.S. government    
Available-for-sale    
Amortized Cost 78,066 77,054
Gross Unrealized Gains 104 88
Gross Unrealized Losses (476) (579)
Fair Value 77,694 76,563
U.S. Agency    
Available-for-sale    
Amortized Cost 5,474 5,473
Gross Unrealized Gains 302 340
Fair Value 5,776 5,813
Non-U.S. govt. & agency    
Available-for-sale    
Amortized Cost 9,511 9,517
Gross Unrealized Gains 86 2
Gross Unrealized Losses (164) (368)
Fair Value 9,433 9,151
Mortgage-backed    
Available-for-sale    
Amortized Cost 276,957 283,002
Gross Unrealized Gains 4,224 4,635
Gross Unrealized Losses (3,467) (3,568)
Fair Value 277,714 284,069
ABS/CMBS    
Available-for-sale    
Amortized Cost [2] 82,915 93,791
Gross Unrealized Gains [2] 653 676
Gross Unrealized Losses [2] (376) (557)
Fair Value [2] 83,192 93,910
Corporate Debt    
Available-for-sale    
Amortized Cost 495,867 503,041
Gross Unrealized Gains 11,216 10,996
Gross Unrealized Losses (3,362) (5,670)
Fair Value 503,721 508,367
Municipal    
Available-for-sale    
Amortized Cost 624,119 624,349
Gross Unrealized Gains 13,099 9,575
Gross Unrealized Losses (4,349) (6,588)
Fair Value 632,869 627,336
Equity securities    
Available-for-sale    
Amortized Cost 192,340 187,573
Gross Unrealized Gains 193,324 182,912
Gross Unrealized Losses (1,735) (1,266)
Fair Value $ 383,929 $ 369,219
[1] Mortgage-backed, asset-backed and commercial mortgage-backed
[2] Non-agency asset-backed and commercial mortgage-backed