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SEGMENT INFORMATION - Segment results (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) reportable_segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | reportable_segment |  |  |  |  |  |  |  |  | 2 |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 6,910,065 | $ 5,556,273 | $ 4,970,208 |
Net premiums written |  |  |  |  |  |  |  |  | 4,658,962 | 4,027,143 | 3,752,974 |
Net premiums earned | $ 1,214,469 | $ 1,224,075 | $ 1,185,548 | $ 1,167,402 | $ 1,211,495 | $ 1,017,131 | $ 981,431 | $ 938,703 | 4,791,495 | 4,148,760 | 3,705,625 |
Other insurance related income (losses) |  |  |  |  |  |  |  |  | 10,622 | (1,240) | 7,222 |
Net losses and loss expenses |  |  |  |  |  |  |  |  | (3,190,287) | (3,287,772) | (2,204,197) |
Acquisition costs |  |  |  |  |  |  |  |  | (968,835) | (823,591) | (746,876) |
General and administrative expenses |  |  |  |  |  |  |  |  | (627,389) | (579,428) | (602,717) |
Underwriting income (loss) | (194,664) | 59,026 | 115,726 | 143,737 | 26,130 | (512,853) | 57,012 | 16,385 |  |  |  |
Net investment income | 113,128 | 114,421 | 109,960 | 100,999 | 100,908 | 95,169 | 106,063 | 98,664 | 438,507 | 400,805 | 353,335 |
Net investment losses | (72,667) | (17,628) | (45,093) | (14,830) | 43,038 | $ 14,632 | $ (4,392) | $ (25,050) | (150,218) | 28,226 | (60,525) |
Foreign exchange gains |  |  |  |  |  |  |  |  | 29,165 | (134,737) | 121,295 |
Interest expense and financing costs |  |  |  |  |  |  |  |  | (67,432) | (54,811) | (51,360) |
Bargain purchase gain |  |  |  |  |  |  |  |  | 0 | 15,044 | 0 |
Transaction and reorganization expenses |  |  |  |  |  |  |  |  | (66,940) | (26,718) | 0 |
Amortization of value of business acquired | (23,000) | $ (39,000) | $ (53,000) | $ (57,000) | (50,000) |  |  |  | (172,332) | (50,104) | 0 |
Amortization of intangible assets |  |  |  |  |  |  |  |  | (13,814) | (2,543) | 0 |
Income (loss) before income taxes and interest in income (loss) of equity method investments |  |  |  |  |  |  |  |  | 12,542 | (368,109) | 521,802 |
Total intangible assets | 379,285 |  |  |  | 566,828 |  |  |  | 379,285 | 566,828 | 85,049 | $ 86,858
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 6,910,065 | 5,556,273 | 4,970,208 |
Net premiums written |  |  |  |  |  |  |  |  | 4,658,962 | 4,027,143 | 3,752,974 |
Net premiums earned |  |  |  |  |  |  |  |  | 4,791,495 | 4,148,760 | 3,705,625 |
Other insurance related income (losses) |  |  |  |  |  |  |  |  | 10,622 | (1,240) | 7,222 |
Net losses and loss expenses |  |  |  |  |  |  |  |  | (3,190,287) | (3,287,772) | (2,204,197) |
Acquisition costs |  |  |  |  |  |  |  |  | (968,835) | (823,591) | (746,876) |
General and administrative expenses |  |  |  |  |  |  |  |  | (519,168) | (449,483) | (482,701) |
Underwriting income (loss) |  |  |  |  |  |  |  |  | $ 123,827 | $ (413,326) | $ 279,073 |
Net loss and loss expense ratio |  |  |  |  |  |  |  |  | 66.60% | 79.20% | 59.50% |
Acquisition cost ratio |  |  |  |  |  |  |  |  | 20.20% | 19.90% | 20.20% |
General and administrative expense ratio |  |  |  |  |  |  |  |  | 13.10% | 14.00% | 16.20% |
Combined ratio |  |  |  |  |  |  |  |  | 99.90% | 113.10% | 95.90% |
Total intangible assets | 379,285 |  |  |  | 566,828 |  |  |  | $ 379,285 | $ 566,828 | $ 85,049 |
Operating Segments | Insurance |  |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 3,797,592 | 2,814,918 | 2,432,475 |
Net premiums written |  |  |  |  |  |  |  |  | 2,324,747 | 1,775,825 | 1,519,559 |
Net premiums earned |  |  |  |  |  |  |  |  | 2,362,606 | 1,816,438 | 1,534,282 |
Other insurance related income (losses) |  |  |  |  |  |  |  |  | 3,460 | 2,944 | 89 |
Net losses and loss expenses |  |  |  |  |  |  |  |  | (1,494,323) | (1,465,427) | (977,771) |
Acquisition costs |  |  |  |  |  |  |  |  | (399,193) | (270,229) | (206,619) |
General and administrative expenses |  |  |  |  |  |  |  |  | (395,252) | (325,368) | (327,351) |
Underwriting income (loss) |  |  |  |  |  |  |  |  | $ 77,298 | $ (241,642) | $ 22,630 |
Net loss and loss expense ratio |  |  |  |  |  |  |  |  | 63.20% | 80.70% | 63.70% |
Acquisition cost ratio |  |  |  |  |  |  |  |  | 16.90% | 14.90% | 13.50% |
General and administrative expense ratio |  |  |  |  |  |  |  |  | 16.80% | 17.90% | 21.30% |
Combined ratio |  |  |  |  |  |  |  |  | 96.90% | 113.50% | 98.50% |
Total intangible assets | 379,285 |  |  |  | 566,828 |  |  |  | $ 379,285 | $ 566,828 | $ 85,049 |
Operating Segments | Reinsurance |  |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 3,112,473 | 2,741,355 | 2,537,733 |
Net premiums written |  |  |  |  |  |  |  |  | 2,334,215 | 2,251,318 | 2,233,415 |
Net premiums earned |  |  |  |  |  |  |  |  | 2,428,889 | 2,332,322 | 2,171,343 |
Other insurance related income (losses) |  |  |  |  |  |  |  |  | 7,162 | (4,184) | 7,133 |
Net losses and loss expenses |  |  |  |  |  |  |  |  | (1,695,964) | (1,822,345) | (1,226,426) |
Acquisition costs |  |  |  |  |  |  |  |  | (569,642) | (553,362) | (540,257) |
General and administrative expenses |  |  |  |  |  |  |  |  | (123,916) | (124,115) | (155,350) |
Underwriting income (loss) |  |  |  |  |  |  |  |  | $ 46,529 | $ (171,684) | $ 256,443 |
Net loss and loss expense ratio |  |  |  |  |  |  |  |  | 69.80% | 78.10% | 56.50% |
Acquisition cost ratio |  |  |  |  |  |  |  |  | 23.50% | 23.70% | 24.90% |
General and administrative expense ratio |  |  |  |  |  |  |  |  | 5.10% | 5.30% | 7.10% |
Combined ratio |  |  |  |  |  |  |  |  | 98.40% | 107.10% | 88.50% |
Total intangible assets | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (108,221) | (129,945) | (120,016) |
Significant Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 438,507 | 400,805 | 353,335 |
Net investment losses |  |  |  |  |  |  |  |  | (150,218) | 28,226 | (60,525) |
Foreign exchange gains |  |  |  |  |  |  |  |  | 29,165 | (134,737) | 121,295 |
Interest expense and financing costs |  |  |  |  |  |  |  |  | (67,432) | (54,811) | $ (51,360) |
Bargain purchase gain |  |  |  |  |  |  |  |  |  | 15,044 |  |
Transaction and reorganization expenses |  |  |  |  |  |  |  |  | (66,940) | (26,718) |  |
Amortization of value of business acquired |  |  |  |  |  |  |  |  | (172,332) | (50,104) |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ (13,814) | $ (2,543) |  |

X
- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities, the change in fair value of investment-related derivatives not designated as hedges and any hedge ineffectiveness recognized in earnings in relation to investment portfolio-related fair value hedges. + References No definition available. + Details
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- Definition The adjustment that represents the periodic charge against earnings to reduce the value of business acquired (VOBA) over the expected life of the underlying insurance contracts. VOBA reflects the estimated fair value of a life insurance business in force and represents the portion of the cost to acquire the business that is allocated to the value of the right to receive future cash flows from insurance contracts existing at the date of acquisition. Such value is the present value of the actuarially determined projected cash flows for the acquired policies. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Ratio of non-life losses and loss expenses, non-life acquisition expenses and non-life general and administrative expenses, to non-life net premiums earned. + References No definition available. + Details
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- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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