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SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) reportable_segment | Jun. 30, 2018 USD ($)
Segment Information [Line Items] |  |  |  |
Number of reportable segments | reportable_segment |  |  | 2 |
Net premiums earned | $ 1,123,607 | $ 1,185,548 | $ 2,257,819 | $ 2,352,950
Other insurance related income (losses) | 2,925 | 3,730 | 9,852 | 10,335
Net losses and loss expenses | (672,463) | (706,641) | (1,336,491) | (1,367,986)
Acquisition costs | (242,363) | (231,952) | (502,781) | (461,212)
Expenses | (165,395) | (165,213) | (340,486) | (335,049)
Net investment income | 137,949 | 109,960 | 245,254 | 210,961
Net investment gains (losses) | 21,225 | (45,093) | 33,996 | (59,923)
Operating lease expense | 4,061 | 8,000 | 11,095 | 14,000
Foreign exchange gains | 12,381 | 44,099 | 5,325 | 6,239
Interest expense and financing costs | (15,607) | (17,098) | (31,502) | (33,861)
Transaction and reorganization expenses | (3,276) | (18,772) | (18,096) | (31,825)
Amortization of value of business acquired | (7,194) | (53,407) | (20,298) | (110,517)
Amortization of intangible assets | (2,912) | (4,029) | (5,914) | (6,811)
Income before income taxes and interest in income of equity method investments | $ 188,877 | $ 101,132 | $ 296,678 | $ 173,301
Net losses and loss expenses ratio | 59.80% | 59.60% | 59.20% | 58.10%
Acquisition cost ratio | 21.60% | 19.60% | 22.30% | 19.60%
General and administrative expense ratio | 14.70% | 13.90% | 15.00% | 14.30%
Combined ratio | 96.10% | 93.10% | 96.50% | 92.00%
Total intangible assets | $ 353,428 | $ 450,073 | $ 353,428 | $ 450,073
Operating Segments |  |  |  |
Segment Information [Line Items] |  |  |  |
Gross premiums written | 1,647,760 | 1,650,825 | 4,230,986 | 4,313,620
Net premiums written | 1,070,321 | 1,000,455 | 2,847,381 | 2,986,326
Net premiums earned | 1,123,607 | 1,185,548 | 2,257,819 | 2,352,950
Other insurance related income (losses) | 2,925 | 3,730 | 9,852 | 10,335
Net losses and loss expenses | (672,463) | (706,641) | (1,336,491) | (1,367,986)
Acquisition costs | (242,363) | (231,952) | (502,781) | (461,212)
Expenses | (133,047) | (134,959) | (271,920) | (274,624)
Underwriting income | 78,659 | 115,726 | 156,479 | 259,463
Operating Segments | Insurance |  |  |  |
Segment Information [Line Items] |  |  |  |
Gross premiums written | 968,325 | 1,026,644 | 1,819,421 | 1,907,492
Net premiums written | 591,909 | 598,179 | 1,121,149 | 1,146,071
Net premiums earned | 537,260 | 577,271 | 1,094,022 | 1,157,330
Other insurance related income (losses) | (695) | 1,214 | 1,046 | 1,833
Net losses and loss expenses | (308,703) | (328,773) | (622,479) | (650,312)
Acquisition costs | (111,655) | (90,864) | (229,430) | (178,193)
Expenses | (104,898) | (102,369) | (210,932) | (204,738)
Underwriting income | $ 11,309 | $ 56,479 | $ 32,227 | $ 125,920
Net losses and loss expenses ratio | 57.50% | 57.00% | 56.90% | 56.20%
Acquisition cost ratio | 20.80% | 15.70% | 21.00% | 15.40%
General and administrative expense ratio | 19.50% | 17.70% | 19.20% | 17.70%
Combined ratio | 97.80% | 90.40% | 97.10% | 89.30%
Total intangible assets | $ 353,428 | $ 450,073 | $ 353,428 | $ 450,073
Operating Segments | Reinsurance |  |  |  |
Segment Information [Line Items] |  |  |  |
Gross premiums written | 679,435 | 624,181 | 2,411,565 | 2,406,128
Net premiums written | 478,412 | 402,276 | 1,726,232 | 1,840,255
Net premiums earned | 586,347 | 608,277 | 1,163,797 | 1,195,620
Other insurance related income (losses) | 3,620 | 2,516 | 8,806 | 8,502
Net losses and loss expenses | (363,760) | (377,868) | (714,012) | (717,674)
Acquisition costs | (130,708) | (141,088) | (273,351) | (283,019)
Expenses | (28,149) | (32,590) | (60,988) | (69,886)
Underwriting income | $ 67,350 | $ 59,247 | $ 124,252 | $ 133,543
Net losses and loss expenses ratio | 62.00% | 62.10% | 61.40% | 60.00%
Acquisition cost ratio | 22.30% | 23.20% | 23.50% | 23.70%
General and administrative expense ratio | 4.80% | 5.40% | 5.20% | 5.80%
Combined ratio | 89.10% | 90.70% | 90.10% | 89.50%
Total intangible assets | $ 0 | $ 0 | $ 0 | $ 0
Corporate, Non-Segment |  |  |  |
Segment Information [Line Items] |  |  |  |
Expenses | (32,348) | (30,254) | (68,566) | (60,425)
Significant Reconciling Items |  |  |  |
Segment Information [Line Items] |  |  |  |
Net investment income | 137,949 | 109,960 | 245,254 | 210,961
Net investment gains (losses) | 21,225 | (45,093) | 33,996 | (59,923)
Foreign exchange gains | 12,381 | 44,099 | 5,325 | 6,239
Interest expense and financing costs | (15,607) | (17,098) | (31,502) | (33,861)
Transaction and reorganization expenses | (3,276) | (18,772) | (18,096) | (31,825)
Amortization of value of business acquired | (7,194) | (53,407) | (20,298) | (110,517)
Amortization of intangible assets | $ (2,912) | $ (4,029) | $ (5,914) | $ (6,811)

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=118932676&loc=d3e3602-108585 + Details
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