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FAIR VALUE MEASUREMENTS (DETAILS) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | $ 12,598,897 | $ 11,986,327
Equity securities | 744,760 | 701,987
Other investments | 1,044,492 | 1,045,810
Short-term investments | 100,166 | 46,212
Derivative assets (see Note 5) | 9,191 | 7,808
Derivative liabilities (see Note 5) | 3,033 | 1,967
Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 12,598,897 | 11,986,327
Equity securities | 744,760 | 701,987
Other investments | 1,044,492 | 1,045,810
Short-term investments | 100,166 | 46,212
Derivative assets (see Note 5) | 9,191 | 7,808
Total assets | 14,497,506 | 13,788,144
Derivative liabilities (see Note 5) | 3,033 | 1,967
Cash settled awards (see Note 7) | 8,656 | 8,693
Total liabilities | 11,689 | 10,660
US Government and Agency [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,598,320 | 1,388,698
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 | 1,598,320 | 1,388,698
Non-US Government [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,247,667 | 1,176,382
Non-US Government [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,247,667 | 1,176,382
Corporate Debt [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 4,263,974 | 3,608,238
Corporate Debt [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 4,263,974 | 3,608,238
Agency RMBS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 2,105,579 | 2,448,827
Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 2,105,579 | 2,448,827
CMBS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 939,694 | 797,414
CMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 939,694 | 797,414
Non-Agency RMBS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 84,946 | 67,567
Non-Agency RMBS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 84,946 | 67,567
ABS [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,306,925 | 953,451
ABS [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,306,925 | 953,451
Municipals [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,051,792 | 1,545,750
Municipals [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,051,792 | 1,545,750
Common Stock [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 385,002 | 438,318
Common Stock [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 385,002 | 438,318
Exchange-Traded Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 235,372 | 138,847
Exchange-Traded Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 235,372 | 138,847
Non-U.S. Bond Mutual Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 124,386 | 124,822
Non-U.S. Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 124,386 | 124,822
Hedge Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 919,919 | 949,810
Direct Lending Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 33,467 | 22,134
CLO-Equities [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other investments | 91,106 | 73,866
Level 1 [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fixed maturities | 1,435,966 | 1,119,632
Equity securities | 620,374 | 577,165
Other investments | 0 | 0
Short-term investments | 0 | 0
Derivative assets (see Note 5) | 0 | 0
Total assets | 2,056,340 | 1,696,797
Derivative liabilities (see Note 5) | 0 | 0
Cash settled awards (see Note 7) | 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 | 1,435,966 | 1,119,632
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] | Common Stock [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 385,002 | 438,318
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 | 235,372 | 138,847
Level 1 [Member] | Non-U.S. 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] | 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 | 11,128,115 | 10,831,878
Equity securities | 124,386 | 124,822
Other investments | 443,111 | 488,755
Short-term investments | 100,166 | 46,212
Derivative assets (see Note 5) | 9,191 | 6,824
Total assets | 11,804,969 | 11,498,491
Derivative liabilities (see Note 5) | 2,283 | 1,152
Cash settled awards (see Note 7) | 8,656 | 8,693
Total liabilities | 10,939 | 9,845
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 | 162,354 | 269,066
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 | 1,247,667 | 1,176,382
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 | 4,263,974 | 3,608,238
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 | 2,105,579 | 2,448,827
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 | 935,761 | 793,396
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 | 84,946 | 67,567
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 | 1,276,042 | 922,652
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 | 1,051,792 | 1,545,750
Level 2 [Member] | Common Stock [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] | 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] | Non-U.S. Bond Mutual Funds [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Equity securities | 124,386 | 124,822
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 | 443,111 | 488,755
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] | 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 | 34,816 | 34,817
Equity securities | 0 | 0
Other investments | 601,381 | 557,055
Short-term investments | 0 | 0
Derivative assets (see Note 5) | 0 | 984
Total assets | 636,197 | 592,856
Derivative liabilities (see Note 5) | 750 | 815
Cash settled awards (see Note 7) | 0 | 0
Total liabilities | 750 | 815
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 | 0 | 0
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 | 3,933 | 4,018
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 | 30,883 | 30,799
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] | Common Stock [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] | 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] | Non-U.S. 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 | 476,808 | 461,055
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 | 33,467 | 22,134
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 | $ 91,106 | $ 73,866

X
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.5) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
Name: | us-gaap_OtherShortTermInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant