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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Current year net loss and loss expenses | $ 2,496,574 | $ 2,419,247 | $ 2,445,666
Net favorable (adverse) prior year reserve development | 292,377 | 243,048 | 258,944
Foreign exchange and other | 205,606 | 215,018 | 230,372
Short Tail Lines Insurance and Reinsurance Business [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net favorable (adverse) prior year reserve development | 148,000 | 152,000 | 207,000
Professional Lines Reinsurance Business [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net favorable (adverse) prior year reserve development | 30,000 | 38,000 | 33,000
Professional Lines Insurance Business [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net favorable (adverse) prior year reserve development | 14,000 | (14,000) |
Credit and Surety Business [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net favorable (adverse) prior year reserve development | 10,000 | 27,000 |
Credit and Political Risk Business [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net favorable (adverse) prior year reserve development |  | (15,000) |
Liability and Motor Reinsurance Business [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net favorable (adverse) prior year reserve development | 99,000 | 82,000 | 40,000
Liability Insurance Business [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net favorable (adverse) prior year reserve development | (8,000) | (27,000) | (23,000)
Catastrophe and Weather-related Events [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Current year net loss and loss expenses | 204,000 | $ 100,000 | $ 93,000
Retroactive Reinsurance Recoverable [Member] |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Foreign exchange and other | $ 150,000 |  |

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- Definition The effect of exchange rate changes on foreign-denominated balances needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. The balance may include other non-material items. + References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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