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FAIR VALUE MEASUREMENTS (DETAILS) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | $ 11,719,749 | $ 12,129,273
Equity securities | 597,998 | 567,707
Other investments | 816,756 | 965,465
Short-term investments | 34,406 | 107,534
Derivative instruments (see Note 7) | 6,467 | 7,264
Derivative instruments (see Note 7) | 18,629 | 18,329
Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 11,719,749 | 12,129,273
Equity securities | 597,998 | 567,707
Other investments | 816,756 | 965,465
Short-term investments | 34,406 | 107,534
Derivative instruments (see Note 7) | 6,467 | 7,264
Insurance-linked securities | 24,925 | 0
Total Assets | 13,200,301 | 13,777,243
Derivative instruments (see Note 7) | 18,629 | 18,329
Cash settled awards (see Note 16) | 33,215 | 20,518
Total Liabilities | 51,844 | 38,847
US Government and Agency [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,651,949 | 1,620,077
US Government and Agency [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,651,949 | 1,620,077
Non-US Government [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 739,005 | 1,033,543
Non-US Government [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 739,005 | 1,033,543
Corporate Debt [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 4,362,769 | 4,361,124
Corporate Debt [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 4,362,769 | 4,361,124
Agency RMBS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 2,249,236 | 2,278,108
Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 2,249,236 | 2,278,108
CMBS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,083,298 | 1,096,888
CMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,083,298 | 1,096,888
Non-Agency RMBS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 101,008 | 73,086
Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 101,008 | 73,086
ABS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,371,270 | 1,461,586
ABS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,371,270 | 1,461,586
Municipals [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 161,214 | 204,861
Municipals [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 161,214 | 204,861
Exchange-Traded Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 473,973 | 454,890
Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 473,973 | 454,890
Bond Mutual Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 124,025 | 112,817
Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 124,025 | 112,817
Hedge funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 656,773 | 818,539
Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 90,120 | 54,438
Real Estate Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 4,929 | 0
CLO-Equities [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 64,934 | 92,488
Level 1 [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,632,355 | 1,497,922
Equity securities | 473,973 | 454,890
Other investments | 0 | 0
Short-term investments | 0 | 0
Derivative instruments (see Note 7) | 0 | 0
Insurance-linked securities | 0 | 0
Total Assets | 2,106,328 | 1,952,812
Derivative instruments (see Note 7) | 0 | 0
Cash settled awards (see Note 16) | 0 | 0
Total Liabilities | 0 | 0
Level 1 [Member] | US Government and Agency [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,632,355 | 1,497,922
Level 1 [Member] | Non-US Government [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 1 [Member] | Corporate Debt [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 1 [Member] | Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 1 [Member] | CMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 1 [Member] | Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 1 [Member] | ABS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 1 [Member] | Municipals [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 1 [Member] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 473,973 | 454,890
Level 1 [Member] | Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Level 1 [Member] | Hedge funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Level 1 [Member] | Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Level 1 [Member] | Real Estate Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Level 1 [Member] | CLO-Equities [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Level 2 [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 10,037,954 | 10,557,720
Equity securities | 124,025 | 112,817
Other investments | 181,632 | 347,621
Short-term investments | 34,406 | 107,534
Derivative instruments (see Note 7) | 2,072 | 7,153
Insurance-linked securities | 0 | 0
Total Assets | 10,380,089 | 11,132,845
Derivative instruments (see Note 7) | 7,692 | 3,041
Cash settled awards (see Note 16) | 33,215 | 20,518
Total Liabilities | 40,907 | 23,559
Level 2 [Member] | US Government and Agency [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 19,594 | 122,155
Level 2 [Member] | Non-US Government [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 739,005 | 1,033,543
Level 2 [Member] | Corporate Debt [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 4,324,251 | 4,345,287
Level 2 [Member] | Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 2,249,236 | 2,278,108
Level 2 [Member] | CMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,072,376 | 1,079,125
Level 2 [Member] | Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 101,008 | 73,086
Level 2 [Member] | ABS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,371,270 | 1,421,555
Level 2 [Member] | Municipals [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 161,214 | 204,861
Level 2 [Member] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Level 2 [Member] | Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 124,025 | 112,817
Level 2 [Member] | Hedge funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 181,632 | 347,621
Level 2 [Member] | Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Level 2 [Member] | Real Estate Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Level 2 [Member] | CLO-Equities [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Level 3 [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 49,440 | 73,631
Equity securities | 0 | 0
Other investments | 635,124 | 617,844
Short-term investments | 0 | 0
Derivative instruments (see Note 7) | 4,395 | 111
Insurance-linked securities | 24,925 | 0
Total Assets | 713,884 | 691,586
Derivative instruments (see Note 7) | 10,937 | 15,288
Cash settled awards (see Note 16) | 0 | 0
Total Liabilities | 10,937 | 15,288
Level 3 [Member] | US Government and Agency [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 3 [Member] | Non-US Government [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 3 [Member] | Corporate Debt [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 38,518 | 15,837
Level 3 [Member] | Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 3 [Member] | CMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 10,922 | 17,763
Level 3 [Member] | Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 3 [Member] | ABS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 40,031
Level 3 [Member] | Municipals [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 0 | 0
Level 3 [Member] | Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Level 3 [Member] | Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Level 3 [Member] | Hedge funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 475,141 | 470,918
Level 3 [Member] | Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 90,120 | 54,438
Level 3 [Member] | Real Estate Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 4,929 | 0
Level 3 [Member] | CLO-Equities [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | $ 64,934 | $ 92,488

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