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FAIR VALUE MEASUREMENTS (Financial Instruments Measured at Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	$ 11,767,697	$ 12,622,006
Other investments, at fair value	833,563	1,009,373
Short-term investments	156,090	83,661
Derivative instruments (see Note 5)	3,383	5,125
Derivative instruments (see Note 5)	15,120	14,386
U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,605,465	1,712,469
Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	548,125	806,299
Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	5,081,085	5,297,866
Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,639,231	2,395,152
CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,076,955	777,728
Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	41,786	46,831
ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,645,811	1,436,281
Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	129,239	149,380
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments (see Note 5)	10,212
Fair Value Measurements Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	11,767,697	12,622,006
Equity securities	433,311	635,511
Other investments, at fair value	833,563	1,009,373
Short-term investments	156,090	83,661
Derivative instruments (see Note 5)	3,383	5,125
Insurance-linked securities		25,090
Total Assets	13,194,044	14,380,766
Derivative instruments (see Note 5)	15,120	14,386
Cash settled awards (see Note 8)	19,096	21,535
Total Liabilities	34,216	35,921
Fair Value Measurements Recurring | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,605,465	1,712,469
Fair Value Measurements Recurring | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	548,125	806,299
Fair Value Measurements Recurring | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	5,081,085	5,297,866
Fair Value Measurements Recurring | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,639,231	2,395,152
Fair Value Measurements Recurring | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,076,955	777,728
Fair Value Measurements Recurring | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	41,786	46,831
Fair Value Measurements Recurring | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,645,811	1,436,281
Fair Value Measurements Recurring | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	129,239	149,380
Fair Value Measurements Recurring | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	13,505	25,658
Fair Value Measurements Recurring | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	273,448	427,633
Fair Value Measurements Recurring | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	146,358	182,220
Fair Value Measurements Recurring | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	251,932	363,811
Fair Value Measurements Recurring | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	268,210	250,681
Fair Value Measurements Recurring | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	67,840	68,812
Fair Value Measurements Recurring | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	63,764	50,009
Fair Value Measurements Recurring | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	47,389	46,430
Fair Value Measurements Recurring | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	24,264	31,413
Fair Value Measurements Recurring | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	110,164	198,217
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,579,758	1,658,622
Equity securities	286,953	453,291
Other investments, at fair value	0	0
Short-term investments	0	0
Derivative instruments (see Note 5)	0	0
Insurance-linked securities		0
Total Assets	1,866,711	2,111,913
Derivative instruments (see Note 5)	0	0
Cash settled awards (see Note 8)	0	0
Total Liabilities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,579,758	1,658,622
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	13,505	25,658
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	273,448	427,633
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	10,120,411	10,910,487
Equity securities	146,358	182,220
Other investments, at fair value	110,164	198,217
Short-term investments	156,090	83,661
Derivative instruments (see Note 5)	3,383	5,125
Insurance-linked securities		0
Total Assets	10,536,406	11,379,710
Derivative instruments (see Note 5)	4,908	2,876
Cash settled awards (see Note 8)	19,096	21,535
Total Liabilities	24,004	24,411
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	25,707	53,847
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	548,125	806,299
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	5,027,985	5,244,969
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,639,231	2,395,152
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,066,184	777,728
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	41,786	46,831
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	1,642,154	1,436,281
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	129,239	149,380
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	146,358	182,220
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	110,164	198,217
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	67,528	52,897
Equity securities	0	0
Other investments, at fair value	71,653	77,843
Short-term investments	0	0
Derivative instruments (see Note 5)	0	0
Insurance-linked securities		25,090
Total Assets	139,181	155,830
Derivative instruments (see Note 5)	10,212	11,510
Cash settled awards (see Note 8)	0	0
Total Liabilities	10,212	11,510
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and agency
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Non-U.S. government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	53,100	52,897
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | CMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	10,771	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Non-Agency RMBS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | ABS
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	3,657	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Municipals
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Common stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Exchange-traded funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Bond mutual funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	47,389	46,430
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	24,264	31,413
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Fair value based on NAV practical expedient
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	651,746	733,313
Fair Value Measurements Recurring | Fair value based on NAV practical expedient | Hedge funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	251,932	363,811
Fair Value Measurements Recurring | Fair value based on NAV practical expedient | Direct lending funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	268,210	250,681
Fair Value Measurements Recurring | Fair value based on NAV practical expedient | Private equity funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	67,840	68,812
Fair Value Measurements Recurring | Fair value based on NAV practical expedient | Real estate funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	63,764	50,009
Fair Value Measurements Recurring | Fair value based on NAV practical expedient | Other privately held investments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Fair value based on NAV practical expedient | CLO-Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	0	0
Fair Value Measurements Recurring | Fair value based on NAV practical expedient | Overseas deposits
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other investments, at fair value	$ 0	$ 0

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Fair value of insurance-linked securities.

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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