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INVESTMENTS - Amortized cost or cost and fair values (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fixed maturities
Amortized Cost or Cost	$ 12,611,219	$ 11,523,316
Gross Unrealized Gains	101,660	70,993
Gross Unrealized Losses	(90,873)	(197,195)
Fair Value	12,622,006	11,397,114
Non-credit OTTI in AOCI	(853)	(823)
Equity securities
Amortized Cost or Cost	552,867	597,366
Gross Unrealized Gains	84,527	53,446
Gross Unrealized Losses	(1,883)	(12,068)
Fair Value	635,511	638,744
U.S. government and agency
Fixed maturities
Amortized Cost or Cost	1,727,643	1,681,425
Gross Unrealized Gains	1,735	1,648
Gross Unrealized Losses	(16,909)	(27,004)
Fair Value	1,712,469	1,656,069
Non-credit OTTI in AOCI	0	0
Non-U.S. government
Fixed maturities
Amortized Cost or Cost	798,582	613,282
Gross Unrealized Gains	17,240	2,206
Gross Unrealized Losses	(9,523)	(49,654)
Fair Value	806,299	565,834
Non-credit OTTI in AOCI	0	0
Corporate debt
Fixed maturities
Amortized Cost or Cost	5,265,795	4,633,834
Gross Unrealized Gains	61,922	42,049
Gross Unrealized Losses	(29,851)	(75,140)
Fair Value	5,297,866	4,600,743
Non-credit OTTI in AOCI	0	0
Agency RMBS
Fixed maturities
Amortized Cost or Cost	2,414,720	2,487,837
Gross Unrealized Gains	8,132	13,275
Gross Unrealized Losses	(27,700)	(35,977)
Fair Value	2,395,152	2,465,135
Non-credit OTTI in AOCI	0	0
CMBS
Fixed maturities
Amortized Cost or Cost	776,715	664,368
Gross Unrealized Gains	4,138	5,433
Gross Unrealized Losses	(3,125)	(3,564)
Fair Value	777,728	666,237
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS
Fixed maturities
Amortized Cost or Cost	45,713	57,316
Gross Unrealized Gains	1,917	1,628
Gross Unrealized Losses	(799)	(2,023)
Fair Value	46,831	56,921
Non-credit OTTI in AOCI	(853)	(823)
ABS
Fixed maturities
Amortized Cost or Cost	1,432,884	1,221,813
Gross Unrealized Gains	5,391	3,244
Gross Unrealized Losses	(1,994)	(2,843)
Fair Value	1,436,281	1,222,214
Non-credit OTTI in AOCI	0	0
Municipals
Fixed maturities
Amortized Cost or Cost	149,167	163,441
Gross Unrealized Gains	1,185	1,510
Gross Unrealized Losses	(972)	(990)
Fair Value	149,380	163,961
Non-credit OTTI in AOCI	0	0
Common stocks
Equity securities
Amortized Cost or Cost	22,836	379
Gross Unrealized Gains	3,412	41
Gross Unrealized Losses	(590)	(342)
Fair Value	25,658	78
Exchange-traded funds
Equity securities
Amortized Cost or Cost	356,252	463,936
Gross Unrealized Gains	71,675	53,405
Gross Unrealized Losses	(294)	(2,634)
Fair Value	427,633	514,707
Bond mutual funds
Equity securities
Amortized Cost or Cost	173,779	133,051
Gross Unrealized Gains	9,440	0
Gross Unrealized Losses	(999)	(9,092)
Fair Value	$ 182,220	$ 123,959

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